Well i'm going to stop.
barineau_clinton: Stop sharing that.
barineau_clinton: So welcome everyone to.
barineau_clinton: To translate across the southern appalachian is my name is clint bear no i'm a professor of Theology at Columbus State University.
barineau_clinton: My to code field trip leaders are Jim told.
barineau_clinton: It for State University and the freshly minted Dr Ben Davis who just defended his dissertation this past week so regulation van.
barineau_clinton: And so, will be your your your guides for the next four hours.
barineau_clinton: Hopefully you all got emails and had a little bit of an overview what we're going to do today and hope I have a good understanding of the the basic structure.
barineau_clinton: We don't want anybody to have to sit in a chair for four hours so we'll be doing one hour blocks with short breaks and we'll have a long lunch break for everybody to go and decompress for a moment before you have to come back to this thing again.
barineau_clinton: So we're going to start this with something similar to what we would do with kind of an opening night mixer on a field trip.
barineau_clinton: and try to spend just the first the first 30 minutes, giving you kind of an overview of where we'll be going today and we're going to break this into three parts and so i'm going to turn this over to Jim toll if soon as I can get his presentation up.
barineau_clinton: In the right place.
let's see.
barineau_clinton: Jim let's see if I can make this work.
barineau_clinton: and hopefully everybody is or will be momentarily see the screen that reads tell the guests like belt.
Jim Tull: yeah well, let me, let me say welcome virtual field trip, and I hope I never have to say that again.
Jim Tull: clint if you go to the next slide.
Jim Tull: So we're going to start out on the Northwest flank of the metamorphic terrain switches the talladega it's like belt, and this is the geologic map.
Jim Tull: Of the Alabama portion of the talladega it's like bell showing the Gulf coastal plain on the left and then the internal strategic fee of the thrust sheet, this is a.
Jim Tull: Low grinches feces.
Jim Tull: A lot on the bite Isaac red crosses just East of the Alabama Georgia border and then i'll show you where the garnet I cigarette is in the talladega belt in a second this strategically ranges from lower cambrian.
Jim Tull: she'll how he grew up into.
Jim Tull: devonian mississippian possibly Mississippi and rocks and so we're going to concentrate.
Jim Tull: Well let's go to the next slide clamp.
Jim Tull: And that's simply shows the talladega belt in Georgia, and you can see.
Jim Tull: there's an indentation that the the.
Jim Tull: brown or 10 unit is the light damn formation, you can see there's an invitation in that that goes down into the eastern blue Ridge that's the mulberry rock recess.
Jim Tull: Which is a an eyelid window and then you can see, the transition into the Western blue Ridge it carter's ville.
Jim Tull: And this figure fee continues into the Western blue Ridge and i'll talk about that briefly so we're going to start next slide we're going to start in the lower cambrian sequence.
Jim Tull: Which is the catchy mountain group next slide clamp and that's best exposed and most completely exposed on the southwest near the coastal plain online.
Jim Tull: And this unit is over four kilometers thick it's thrust bounded at the base so we never see the base of it.
Jim Tull: And it's cut from the top, by a regional unconformity, which is the prelate am on conformity and so as it occurs along the Northwest flank of the talladega belt this continuously being cut.
Jim Tull: By a thrust fault at the base and then from above by original unconformity so this these rocks are mainly P lights their their carbonaceous graphic they also include sand stones and there's a marble unit near the Center of the group next slide.
Jim Tull: So this shows the Southwestern part, you can see, the Gulf coastal plan on the lower left and the catchy mountain group, which is the chill how equivalent is shown in Gray.
Jim Tull: And that's overlain by a thick carbonates sequence, which is the camera or division carbonate bank.
Jim Tull: And there are archaea sciences, right at the base of that carbonate sequence, so we know the catchy mountain group is lower cambrian based on that.
Jim Tull: The basal thrust is cut by a number of folders which give us half windows that i'll talk about later, but you can see some of those falls in this diagram next slide.
Jim Tull: This is the catchy mountain group expose just north of the coastal plain broken out into formations.
Jim Tull: The upper most sequence is the.
Jim Tull: Watch quick slate and you can see that forms a series of mountains.
Jim Tull: Columbia and a mountain Colombian mountain and then catchy mountain and so forth along the the thrust front and you can see, I have some have windows there and i've colored in our black, then the Sawyer limestone which is shown in the middle of the section.
Jim Tull: which was apparently an early attempt to start to carbonate bank formation, but then that was overwhelmed by sedimentation above that and then.
Jim Tull: As we do go to the southeast the catchy mountain groups overlain and gravitational contact by a dogmatic marble unit, which is lower cambrian which has archaea silence so next slide.
Jim Tull: This is a panel that goes from the coastal plain that those panels down there on the left.
Jim Tull: are the ones that we just saw in the southwest and it goes over into Georgia rock more to the Northeast and what I show here this these sections are pinned on the basal carbon a unit, the jumbo dolomite.
Jim Tull: And you can see the talladega connersville fall, which is the bazell thrust is is discordant to the strategic V it rises, as you move to the Northeast and actually cuts above the unconformity that's cutting down from the top.
Jim Tull: near heflin and then over into morton springs.
Jim Tull: You start getting back into the catchy mountain group, and that that continues east of rock more than then on up into the carnival recess.
Jim Tull: Next slide.
Jim Tull: This shows correlations here the catchy mountain groups in the Center there on the left in the talladega belt.
Jim Tull: And that continues into the blue Ridge, and that same strategically exists in the blue Ridge in the core or in the on the flanks of the Murphy Sinclair them.
Jim Tull: In the nano haleigh brasstown units which are overlain by the Murphy marble the catchy mountain panel on the left, there is overlain by the.
Jim Tull: jumbo dolomite and then the fatherland panels most of you familiar with the tool how a group of shown there on the top overlain by the shady dolomite.
Jim Tull: And then it's thrust faulted at the base In most places until you get to that upper panel where it sits on greenville basement.
Jim Tull: And then the lower part of that diagram which can't see very well as the pine mountain belt in a lot of us think the units, there are equivalent in hollis courtside has been correlated with the chill howie and that's a locally overlain by marble again, which is the.
Jim Tull: gosh what's the name of that marble.
Jim Tull: So another creek Indian name.
Jim Tull: Chocolate chocolate marble yeah next one, so if we put those panels in lb spastic space way over on the left is the plateau and there are drill their wells there that that go through to basement and don't show any.
Jim Tull: tool how a group so that you know how a group is first scene in eastern philanthropies sheets.
Jim Tull: But they restore in this model to the southeast of the mountain window, which is under retro deformed here, and then the catchy mountain group is the most distal part of the chill how a group which has shown on the right, and these right two panels.
Jim Tull: Are have been pulled off their basement and that basement has been abducted, so there they restore beyond the.
Jim Tull: The sooner that you can see there underneath next slide.
Jim Tull: Now we'll look at the overlying camera or division carbonate bank next slide.
Jim Tull: Which is completely go go up one go back one clue.
barineau_clinton: Okay, hang on.
Jim Tull: A second to catch up Okay, no that's that's fine that's shown here now silica ago where we named the the group of carbonates Marbles
Jim Tull: Where the most complete section is and that section in the silicon area is almost three kilometers thick and we've been able to divide that into a number of units next slide.
Jim Tull: That shows that.
Jim Tull: area in West of silica the lower unit is the jumbo dolomite and you can see a red dot there on the left, where we found our kids ipads and those are only found in the lower cambrian lower most cambrian also in the.
Jim Tull: shady dolomite.
Jim Tull: Then we this has been very lucky we found kind of dots in the upper part of the unit which are upper most lower division, those are shown on the upper right.
Jim Tull: And then we've got trial bites from the Center part of the section, so that certainly fossils are very difficult to find in these rocks, but we have been able to get them from the base the top and near the Center of the unit next slide.
Jim Tull: These are the some of the lower cambrian rk of sciences.
Jim Tull: that occur in the jumbo dolomite which which correlates them directly with the shady dolomite in the fatherland next slide.
Jim Tull: There are a lot of primary structures in these Marbles, you can see pies the lights, we found who lights.
Jim Tull: All kinds of alcohol features a lot of primary features, even though they're green just bases So these are all shallow water units.
Jim Tull: On the platform, but these are the most distal segments of the camera or division carbonate bank that you're ever going to get to see and, of course, many of these marbles have been quarried for industrial purposes next on.
Jim Tull: This shows a mill cambrian trilobite from.
Jim Tull: The shelving rock church unit there's a Meta sandstone in there that we found.
Jim Tull: lance Johnson found this trial by it on his master's thesis, and this is, it would be equivalent to the kind of saga next slide.
Jim Tull: And then the other part.
Jim Tull: Working with Anita Harris years ago in the usgs we recovered kind of dogs from the upper part of this photography, and these are upper most lower division equivalent to the wall limestone and they are heated to.
Jim Tull: color alteration indices five and a half, which, which is compatible with the Green shoes faces over print next slide shows.
Jim Tull: Those kind of dots in there classifications.
Jim Tull: Next line.
Jim Tull: So this working out the strategic up and having ages assigned to these units gives us almost a perfect one to one match.
Jim Tull: With the for land camera or division carbonates sequence, although the names are different, we can make pretty accurate correlations into the fatherland panels that everyone's familiar with, and the thickness is very similar.
Jim Tull: Both of these units monthly sequences of course her underlying lane by the chill how we grew up.
Jim Tull: In the in the talladega belts they had a mountain group and then their unconformity is that step through that section from the top, and the talladega belt that unconformity is that the base of the latest information, which is what will discuss next.
Jim Tull: So above that unconformity or units that we call part of a successor, based in sequence, and these range in age from possibly solar into possibly lower mississippian next slide.
Jim Tull: So on the left, you can see the talladega belt and the orange unit is the latest information, which is what we're going to discuss now that extends northeastern into Georgia and then, along with the catchy mountain group, we think it extends into the Murphy belt and i'll point out.
Jim Tull: That there are these younger.
Jim Tull: unconformity overlying sequences that we call successor basins one was found had been known for a while rick.
Jim Tull: Think pin at at can university Kentucky working with john petrucci found kind of dots and number.
Jim Tull: Four there, which is the maggie's mill.
Jim Tull: formation and then recently Mary beth Lupo.
Jim Tull: And she just published a paper we just published a paper with john or pet scan Paul Miller and just a bolt on last year from the foothills bell foothills belt in a unit.
Jim Tull: It sits uncontrollably on the chill how a group which has shown and dark color there and then that unconformity steps down to the Northeast.
Jim Tull: to wear that successor base and sits on the kelley supergroup and then, when we moved to the South in the Murphy belt, we see the same thing we see the successor, based in sequence, which we call the mineral bluff group stepping through.
Jim Tull: The Murphy marble down into the nano HALO brasstown, which is the chill how equivalent, and then it locally steps, all the way down into the supergroup.
Jim Tull: So these paleozoic successful basins we're talking about are are pretty extensive they're only located in sin sinful inverse England area in the blue Ridge, but in the talladega belt it's well exposed in the lady information which i'll talk about now.
Jim Tull: Next slide.
Jim Tull: This is back to the southwest where the the grade metamorphic grade and the strain levels are lower.
Jim Tull: You see, the coastal plain on lap there and the orange unit is the latest information, this is the type section of lay down, you can see the coosa river.
Jim Tull: In that second quadrangle to the left and over 50% of this several kilometer section here in the late information are some marine debris flows their dynamic tights polly make the coarse grained I make tights next slide.
Jim Tull: This shows the subway damn on conformity north of silla kaga on the right and then down at jumbo we're clint will discuss this to the left.
Jim Tull: And that that surface locally assured but it's a clearly an unconformity that we have mapped along that boundary next slide.
Jim Tull: In that in those dynamic tights we find a whole suite of types of carbonate class from MC right to dolomite some of these have primary features in Hong Kong lights.
Jim Tull: crypt optical structures and we've never been able to recover any fossils from any of these carbonate class.
Jim Tull: But on the lower left there you see a mixture of other types of rocks there's a carbon graphic fill a.
Jim Tull: Class there, which we think is coming out of the catchy mountain group and then years ago Roy them and I sampled some of the grenadian nice blocks that are found here and those give grenville zero con ages.
Jim Tull: Their suite of Granite toy boulders that you can see there and they actually make up the most common class, along with the carbonate class next slide, these are all matrix supported.
Jim Tull: embedded and some of these debrief flows are very thick there over 100 meters thick.
Jim Tull: And they the grain size ranges from.
Jim Tull: clay basically to boulders some of the boulders are up to two meters in diameter next slide.
Jim Tull: we've been able to recover continents, I found these in the some lady i'm phil lights, these are.
Jim Tull: moles that that I found and I need a Harris.
Jim Tull: I think, for the first time, was able to score latex into these moles and recover these continents, and these are post or division next slide.
Jim Tull: This slide shows back to the coastal plain, you can see the lady information coming over just to the right of where it says Gulf.
Jim Tull: And that's where those continents were recovered out of the upper part of the light damn, but we know.
Jim Tull: That the late am can't be any younger than devonian because it's overlaying by the budding Ram sandstone shown there and yellow which has mega fossils and then the Thompson shirt and the mega fossil localities are shown in rental get to that in a minute next slide.
Jim Tull: These are some of the turbo lights that are intermixed with the dynamic tights these are really nice some of these are graded and they're also deep water conglomerate medic medicine stones in these Emily damn next line.
Jim Tull: Now we'll look at the overlying rocks the battering ram sandstone which continues to the Northeast and becomes the main rich former in East Alabama, which is the heart courtside and then that's overlain by the blue unit, which is the dermis and short next slide.
Jim Tull: This is a column of the Germans, when you can see it sits on the budding round courtside.
Jim Tull: hit the base and it's overlain and fall contact by the he'll be greenstone that will get into later and on this column i've put in the mega fossil localities that we found.
Jim Tull: You can see, there are a lot of sticky lights swan spicules in these church, but they're also browse owens and bracket pods and, most importantly, 10 tacky ladies that we found next slide.
Jim Tull: You can see some of the bracket pods there, those are from southwest of jemison and 10 tacky ladies, are the most definitive fossils they date.
Jim Tull: The jemison as late early devonian or older, but no younger than early late devonian.
Jim Tull: And, but if you go back one slide clint.
Jim Tull: You can see those mega fossils other than speaking lights don't occur, we never found them in the upper part of the jemison so the age could range to younger than middle devonian next slide.
Jim Tull: Next line.
Jim Tull: And these are some of the photo micro graphs of the specie lights.
Jim Tull: next one.
Jim Tull: And I I give a shout out here to one of my early colleagues at the Alabama geological surveys Tony another my first year at the University of Alabama I went on the talladega field trip, which was led by Danny Pearson.
Jim Tull: From uab and jack Carrington from auburn and you can see here tony's interpretation of the regional strategically, and this is Southwest on the right and northeast on the left, normally we don't do it that way.
Jim Tull: But, at any rate it's got the pre lay down unconformity at the base, where we sit on camera or division.
Jim Tull: Carmen a bank, then the lady information in the middle, with the dynamic tights and then up at the top on the right or the is the jemison shirt and then that correlates to the left with the Aaron slate which we'll talk about later and both of those are facility for us units.
Jim Tull: And so that that correlation is really important In between there, you can see, the funding round sandstone and what was called the able gap formation back with any beer city or courtside on the Left next slide.
Jim Tull: Just briefly will discuss the bounding part of the the i've already talked a little bit about the talladega carnival fault at the base.
Jim Tull: That cuts strategically it cuts metamorphic fabrics it cuts fabrics in the fatherland and it cuts through sheets in the fall and.
Jim Tull: The upper boundary is the hollins line through us system, which is a transformational duplex the roof thrust is the horns on fault, which is the major displacement thrust fault in the eastern blue Ridge, and then that breaks into the foot wall.
Jim Tull: In a series of Member kits or horses, which include an earlier in place thrush sheet, which is the syllabi greenstone we'll talk about in an earlier thrust, which is the hillbilly thrust, which is writing piggyback on those horses within the duplex.
Jim Tull: That.
Jim Tull: fault system is folded by some of these regional cross falls, you can see, one on the upper right there in melville it's called a millennial Anna form.
Jim Tull: And then that folders decapitated by a still younger fall which we'll talk about which is good, what are needed chapo fault, which is really the altoona fault next slide.
Jim Tull: Importantly, the placement of the talladega lock on.
Jim Tull: postdates.
Jim Tull: structures in the forest and it cuts foreign thrust sheets and it cuts.
Jim Tull: map scale falls in the forest on, so this is an out of sequence fall and i've got a column here on the bottom, which is from cooking Thomas, and you can see, the scale there's only several hundred meters across but it shows decapitation of the know Allah and.
Jim Tull: The Middle or division, or some of the Athens shale in its core the same clients by that thrust and then at the top, is in Georgia as a column as a.
Jim Tull: Cross section that I made that shows decapitation of these map scale foals which include rocks as young as.
Jim Tull: For pain, a church and probably floyd shale and their cleave they have a good lady cleavage in that thrust fall just rips right across the top of all those holes.
Jim Tull: So there's there's clearly earlier defamation in the southeastern for land thrust sheets that predate the placement of the talladega College will fall so it's definitely an out of sequence for next line.
Jim Tull: This shows the uppermost fall, you can see, the Western blue Ridge there in Georgia that's that's the altoona fault was first named by Vernon hearst in 1973.
Jim Tull: And then we map that down into the mulberry rock recess, there is one of the eyelid window faults around that recess, and then it continues southward through tell kusa and then down across into Alabama too hot our Alabama next slide.
Jim Tull: Oh, first of all let me point out that the altoona fault, this is the carters will recess going all the way across the foreign land and Georgia and Alabama.
Jim Tull: And that that shows all the strange things that happened across that cross strike structure, which is the carters Atlanta form.
Jim Tull: transverse known that's been recognized for a long time, but the altoona fall decapitate that full and therefore the altoona defaults the youngest fault in the kinematic sequence, and it cuts structures to cut Pennsylvania rocks so it's probably a permian structure next slide.
Jim Tull: And that continues down once again too hot tower Alabama you can see here and there, at the decapitated another cross fold how tower Hannah form, and it also cuts the holland's Lon and he'll be thrust there and then continues down to the southwest next slide.
Jim Tull: So you can see more detail there of the altoona fall cutting through the pole bridge mountain group into the mad Indian group next slide.
Jim Tull: And then, this is back from a from an early guidebook that I did with Tony and other in 1975 we first started recognizing.
Jim Tull: The good water need to chop go fault and now i'm I think it has to be renamed the altoona fall because that's the earliest name.
Jim Tull: fault there's been confusion down at good water, because one of my doctoral students found a fall under the railroad cut there and good water, which is a normal fall.
Jim Tull: But it turns out this fall, which is a thrust fault is to the northwest of that fault and that's an internal blue Ridge fault, so what you see here.
Jim Tull: Coming South from high tower is the altoona fall which bounds the talladega bell to the north, once it gets too hot tower becomes an internal Eastern blue Ridge fault and, once again, is the latest fault in the kinematic sequence next slide.
Jim Tull: All right, so i'll turn it over to clamp.
barineau_clinton: All right, Thank you everyone, let me just say this field trip is.
barineau_clinton: Ambitious we would have never attempted to do all this in an actual field trip, but I think once we realized, we could kind of zoom around Google Earth.
barineau_clinton: We got a little ambitious on our own what we were trying to do so, I realized that.
barineau_clinton: that some of this is like drinking from a fire hose and I would encourage all of you that are interested, a lot of these stops that will see.
barineau_clinton: have been previously published and other guidebooks i'm more than happy if you email me to provide you with any of those guidebooks so what i'll do now is i'm going to jump to just a quick overview.
barineau_clinton: Of the eastern blue Ridge, and then i'm going to turn it over to begin.
barineau_clinton: To discuss the Piedmont, so let me say this also meant to remind everyone if you have questions, we will have time for questions if you have questions i'm going to ask Ben if he wouldn't please my monitoring the chat for me.
barineau_clinton: And in bringing those questions up at the appropriate time and, of course, will all give you an opportunity to unmute your microphones and ask questions that he has you have thumbs up.
barineau_clinton: Alright, so, hopefully, everyone can can see a screen that says Eastern blue Ridge, and so that's what i'm going to just provide a brief overview of.
barineau_clinton: So, Jim just spent a lot of time talking about the the talladega belt here that's that's separate between the talladega quarters will fall against the for land.
barineau_clinton: And of course edits it structurally uppermost boundaries, the hollins line in Alabama and then right around the GA elemental boundary becomes altoona fall.
barineau_clinton: And so what i'm going to discuss or the rocks between the altoona and hollins line fault and the performance zone, which is part of the Eastern blue Ridge, now the term the eastern blue Ridge is itself a composite terrain.
barineau_clinton: And we're looking at one small section of that composite Eastern blue Ridge.
barineau_clinton: And so, in this area, this portion of the composite he's from Blair is just simply known as the national medallia mcfaul belt again it's constrained by the horns line edit structural base.
barineau_clinton: By the the band default on the lower part of the Board zone structural top and it's separated from rocks of.
barineau_clinton: The blue the eastern blue Ridge in especially central northeast Georgia by the chattahoochee fall and so we're really talking about this portion that goes from Alabama into kind of central Georgia.
barineau_clinton: The the geology itself looks at bounded by the horns line there and bounded has a has as Jim mentioned internal fault.
barineau_clinton: The altoona fault, which comes down into Kappa takes the Holland fun here and continues as he pointed out and follows the trace of what we have historically considered the good water need to chop Co.
barineau_clinton: But again altoona fault seems to be the is a discourse the older of the two and should take precedence over those and that fault really tips out here, near good water Alabama.
barineau_clinton: It follows in this area, the boundary between the lowest photography that will see here shortly, which is the action supergroup and the youngest photography above it.
barineau_clinton: south of good water based on work by by David ellison during his doctoral work and his work done at South Alabama.
barineau_clinton: shows at once, you get much past good waters in South this just the displacement on this fault tips out and this becomes basically a default poly deformed strata graphic contact in which the displacement on fall is being compensated by some folding in that region.
barineau_clinton: We have a second internal fault, which is Alexander city fault and that emerges from the coastal plain.
barineau_clinton: And then stretches up in that fall itself also tips out around Alexander city and we'll talk a little bit about some some alternative altering or different interpretations about that and the significance of those and then, finally, the band default marks the structural top of it.
barineau_clinton: So, just a quick quick drive to the strategic thing and again, we will be going to outcrops will have the opportunity to discuss all these things if you if anybody has questions later on in the talk again, we will put this in the context, without crop so.
barineau_clinton: The lowest most unit in the in the ashram would I mcfaul bell is the Higgins ferry and equipment programs mountain groups of the lower ashlyn supergroup.
barineau_clinton: they're predominantly met up he likes schist with with varying mineralogy including some really rare binyam bearing micah's roscoe light.
barineau_clinton: That has some economic importance in the area, but that's the dominant mythology.
barineau_clinton: there's there's subordinate paradise they're basically fine grained by uptight nice's their their court sites, they are even calc Sola kits.
barineau_clinton: And then we have a sequence of inhibit lights the Mitchell name into the light and the catch for draconian giveaway, along with other lot of other unnamed.
barineau_clinton: into lights that will see at some outcrops and discuss along with magnetites and magnetic magnetic nice's.
barineau_clinton: that's in overlain by the upper Echelon supergroup, which is the hatchet creek and equipment man Indian groups and again.
barineau_clinton: Live illogically there there's some similarities differences, but again they're they're dominated by men up lights with with a variety of compositions.
barineau_clinton: But good starlight kind of Selma night minerals denoting that kind of middle a printable at grade again by type here nice court sites Councillor kits and again info blight stigma tights and a metallic Nice.
barineau_clinton: overlying the essence supergroup is the valley group.
barineau_clinton: With our group again dominated about Meta P likes, in fact, these entire sequence or rocks are predominantly Meta political nature.
barineau_clinton: graphite courts fells bar Ghanaian garnet contact Silva night again indicative of that middle a printable a faces.
barineau_clinton: More more by type paradise and uncommon court site and and fill light in May, those regions and then we're going to talk in a minute about a lot of these solicit futons that we also see in here.
barineau_clinton: Above the one now a group, the Group is again Meta P lights variable a graphic by type paradise courtside also you know gone up mirroring schist.
barineau_clinton: And him civilized one of the the logic changes that we see as we go from with our group into the month, our group is with our group does tend to in places, be very prophetic rich and so they're good you know to micro graphite graphite gone it's just.
barineau_clinton: that are more common, especially in the upper medallia group than they are in the fall and that's one of the ways that we know that that boundary between the two.
barineau_clinton: If we look at some of the mythologies internal fallacies to some of these units, all we see is in the lower ashland and Higgins ferry PO bridge mountain groups, we have those into the lights.
barineau_clinton: are fairly extensive and one of my one of our colleagues, Chris Holmes noma and others who worked on these i've done some geochemistry on them.
barineau_clinton: And they appear to have good mid ocean rich kind of within plate basalt chemistries and so when you couple that with that with the counselor kits and.
barineau_clinton: And the dominant Meta politik nature of these units, then they they kind of look very typical of a basically a riff riff base and of some sort.
barineau_clinton: With makeup magnetism if we look above that what we see is once you start getting into the upper ash and supergroup into the hatchet creek man Indian you start picking up a lot of solicit futons that range in age from ordovician.
barineau_clinton: futons like the zeno Granite and the culture that also range into the salary in all the way up into carboniferous futons and so those are really intruding.
barineau_clinton: Again, the upper Echelon supergroup all the way up into the upper group i'm always reward zone and has been will show, many of those cross into the billboards and especially the collage.
barineau_clinton: We know from the trials are con work and Upper would alley and lower a monk for that we have good or division titles are cons.
barineau_clinton: And so, gives us least some some constraints on depositions age.
barineau_clinton: We also know that those in civil rights have good mixed mid ocean rich basalt to kind of island are totally I to art geochemistry is on a lot of different trace diagrams.
barineau_clinton: We know that mixed kind of mid ocean rich art geochemistry is very typical a backyard basins, and so we we interpret the the environment of deposition of the medallion mcfaul group.
barineau_clinton: As basically being in in ordovician back our base, and that was being intruded by by solicit Magnus that were crystallizing to form protons like design and and collide yeah.
barineau_clinton: During during ordovician basically during the two car garage me so if we couple that with what we know about the lower part of the sequence, which is the action supergroup and i'll again go back to the map here in just a minute.
barineau_clinton: These look like some sort of lifted lifted margin essentially a slope arise with constantly derived materials mage solicit classics but also salts that has again those typical within plate to mid ocean rich.
barineau_clinton: geochemistry that's basically overlain by this ordovician distillery and backyard basin and one of the big questions we have.
barineau_clinton: This point is well what's going on between these two, and this is a discussion that Gemini have had on many occasions.
barineau_clinton: Is if if we are correct and the astral supergroup potentially represents the rift and prism of laryngeal it's the neoproterozoic.
barineau_clinton: margin that is then subsequently repeated again as part of an automation backcourt basin is how do you recognize the transition between the two.
barineau_clinton: and obviously geochemistry to try to work on ages, it needs ages all would be important for this, and I think we're seeing some of that work being done, and so it'll be interesting to see as people do more and more work in the transition between the ashland to the download group.
barineau_clinton: You know whether or not these these models hold up and the question is how how far back does this back our base and go into the strategic fee.
barineau_clinton: So, to put this all in the context.
barineau_clinton: there's our eastern blue Ridge rational medallia mcfall bell is it stretches from Alabama and Georgia.
barineau_clinton: We know from the talladega Belt is Jim is described that it basically represents the luncheon shelf it's got all the characteristics elements and shelf and correlates with what we know from the Falkland.
barineau_clinton: We know that the wood allina mcfaul groups, especially represented ordovician to salary and back art basin that was receiving laurentian continental detritus that was being had a lot of may think volcanic was being treated by ordovician distillery and Pluto ones.
barineau_clinton: We also.
barineau_clinton: get our must our current thinking is that the action supergroup and the very least, the lower part of it.
barineau_clinton: is consistent with a neoproterozoic laurentian slope rise basically the the breakout of the ratio from Romania.
barineau_clinton: At about 570 and so that would be that slope rise, and this would make a lot of sense to to have their own she mentioned shelf here.
barineau_clinton: lunch and slow prize in again a luncheon back our base and running proximity to one another and, of course, has been is going to discuss later we know now that the day bill complex is a is a board admission Arc.
barineau_clinton: One of the one of the things that that i'll i'll end on and, of course, again we're going to see some of these outcrops and talk more about this, but i'll end on.
barineau_clinton: The discussion of displacement along these internal falls, like the Alexander city like the altoona.
barineau_clinton: And the reward zone, and so what i'll say is this a lot of people have worked in these regions and and recognize that many rocks in these basins, are in fact Milan, and it can nature they show good evidence.
barineau_clinton: For intense hearing and, in some cases we have people researchers who are arguing that some of those Maronites accommodate literally hundreds of kilometers displacement.
barineau_clinton: And so, in in some of that has been placed along the Alexander city fault here that that people argue tracks, along with medallia mcfaul.
barineau_clinton: basins some of that is placed within the board zone and what i'll point out is, we need to consider the logical consequences of these these interpretations of hundred kilometers displacement.
barineau_clinton: Because if, in fact, we do have significant displacement along those internal false alarm the billboards on for some reason it has conveniently placed.
barineau_clinton: An order division Arc on top of an automation bacharach sequence, which is in top of another ordovician backyard sequence, which seems to be on top of the original slope rise, which seems to be top.
barineau_clinton: level or ancient shelf and so that's a lot of coincidences, and so I think we really need to call into question.
barineau_clinton: You know, when we when we identify Milo nights and we'll we'll discuss more of this when we identify my own eyes, we need to really start thinking about.
barineau_clinton: When we're discussing magnitudes of displacement, what is the evidence for that displacement, aside from the model itself can we assign magnitude.
barineau_clinton: tomorrow night, and I think that most people who work in my lights around the globe would argue that that's a bit challenging and so, in this particular case, this is, I think this is an important part of this discussion so.
barineau_clinton: With that i'm going to turn it over to Ben and then we're running low on time and in i'll point out, we may or may not be able to get to all of our outcrops, but we will definitely try to get to to those outcrops.
barineau_clinton: That we have not previously published before so Ben i'm going to turn this over to you.
barineau_clinton: All right, let me get your slideshow up.
barineau_clinton: Alright, hopefully, everybody can see that.
Ben Davis: All right, well thanks again guys, for you know sitting here on a Saturday, even though it's gorgeous outside.
Ben Davis: But we're going to talk about the inner Piedmont now, so you can go ahead next slide.
barineau_clinton: The moon stop.
Ben Davis: You can you can skip this one, I think everybody kind of knows where we're working at now.
Ben Davis: Okay, so there.
Ben Davis: Is a an extensive composite terrain of Northwest directed thrush sheets cropping out between the star Tom mountains window and the Smith river locked on in western North Carolina and to the.
Ben Davis: Gulf coast, a plane on lap and Alabama northwest of the inner Piedmont is the sort of the strategic fee that Dr toll and Dr berna have been talking about.
Ben Davis: Basically, as you come down out of the ashlyn would alley i'm not far though you cross into strategic afraid of the dark zone or the jacksons gap group.
Ben Davis: And if you cross over that, then you cross into what Dr Vera know just showed the table complex, which is mainly men against some Meta seminary rocks.
Ben Davis: A lot of fellowship new tonics ultramarathon crocs on so its lesser Meta sedimentary, then the eastern lyric strictly griffey.
Ben Davis: If you cross over the danville complex to the southeast you cross over the stonewall line fault, which is the southern bounding fault of the data bill and it brings you into the sugar free of the open like a group so you have.
Ben Davis: schist courtside units, you have the aba information and it's all in treated by the Farm Bill Meta Granite formerly known the bottle granted.
Okay next slide.
Ben Davis: So this is just a figure from I believe Michelle.
Ben Davis: And it just shows how expansive the the inner Piedmont is, you can see the on this sort of the bottom left corner over there, this is the the danville complex and Alabama as it crosses into Georgia.
Ben Davis: The area of the database complex in Georgia is still being I guess actively researched, so we don't know the full extent of it.
Ben Davis: goes up into South Carolina.
Ben Davis: But future work will sort of help us figure all that stuff out, and you can go to the next one.
Ben Davis: Okay, so if we look at the de ville complex and we try to break out what exactly is going on there.
Ben Davis: In Alabama Georgia it's a large ordovician volcanic arcs fragment consisting of basalt guavas and toughs with lesser and lesser felt like volcanic.
Ben Davis: Its interconnected with inter Arc Meta sedimentary basins, these are country rocks, also known as the curriculum shift and the ropes creek and fill it they've all been interested by Grenada can total total Olympic athletes and also bodies of Gaborone or a and practice night.
Ben Davis: The danville locked on live structurally upon a large companion backlog, based on the Dr Bernard was just talking about.
Ben Davis: And it's up similar age um it's referred to as the with dahlia mcfall Delano go backwards basin, which you can see where he's cursor is right there all right next slide.
Ben Davis: Okay, so if you strip away all the geology and you start looking at just the general structures in the table complex, there is a massive F3.
Ben Davis: sin form, known as the classy same form it's a gently w plunging sin form that stretches up into Georgia and closer to Atlanta, the same form, I believe was named by Higgins at on 1988.
Ben Davis: The noon Tucker send form, so you can see that this is a very large scale feature or structure there's smaller folds.
Ben Davis: In the devil complex that actually followed the stonewall line fault, you can see the boys creeps in form.
Ben Davis: right there and the EU citizen form which was actually access kind of a cross folder structure there's a few more in Georgia, that are currently unnamed but they've only been recon so far.
Ben Davis: um next slide.
Ben Davis: Okay, so the the big idea with the devil complex is being an ordovician art or an Arc fragment.
Ben Davis: um it's kind of separates itself from the interpretation that's in the northern appalachians so in the northern appalachians you had a abducted created terrains during the demonic.
Ben Davis: that's well recorded within the rock record, but if you move to the southern appalachians it's kind of hard to put put and abducted accreted train.
Ben Davis: In the southern appalachian So how do you do that well, you can put in a transparent already reversal somewhere in the sinful appalachians and then you can have different types of seduction taking place along the the eastern.
Ben Davis: Southern appalachians we interpret that there's a B type subduction where literature was the overriding plate, and you get the database complex forming.
Ben Davis: On distended laurentian crust as well as the the associated bacharach basin, and so you have the appetite in place going underneath fueling all of this and.
Ben Davis: yeah so next one.
Ben Davis: So you have all that and then during the allegheny and you start thrusting.
Ben Davis: So you have the medallia mcfaul belt backyard basin they they get displaced and it's roughly around 80 kilometers.
Ben Davis: And then, following that is the davao complex and it gets thrust right on top of the backlog basin roughly about 50 kilometers so.
Ben Davis: Initially, the stonewall line i'm thrust Vance through the database complex like climbing up a frontal ramp obliquely.
Ben Davis: Through about 16 kilometers of deformed and metamorphosed volcanic arcs tectonic stratigraphy and upon its arrival in onto the adjacent without we might fall.
Ben Davis: back our base into the Northwest the thrust flattened and sort of playing across an enormous football flat.
Ben Davis: In the mechanically week mica schist dominated jackson's gap group or the equivalent loach polka formation snub or formation poor mountain formation Chakra river formation are triggered group.
Ben Davis: And with the devil complex advancing 50 kilometers across the youngest preserved kicker fee and it's a Jason medallia my Paul Delano go backward basin next slide.
Ben Davis: So.
Ben Davis: On this figure right here, you can see how expansive some of these Meta igneous rocks are.
Ben Davis: If you look at the the unit and blue inside the devil complex that would be the robes creek and fill the light if you look at the pH unit, we.
Ben Davis: that's right in there, that is, the camp hill nice if you go to the the pink where you just where that is the chatter soft creek Nice, also known as the rock mills Nice, the Franklin Nice, and as you get further up into Georgia closer to Atlanta becomes the.
Ben Davis: Equivalent stonewall Nice.
Ben Davis: The medicine, a million units that's dominated in the date ville and camp hill quadrangles is the curricula shift and green.
Ben Davis: In the black units are the medical term a few crocs, including the DAS mountain.
Ben Davis: Men are more for matrix we, as well as the slaughters gabrielle and you can see there's isolated pockets of these ultra mega crocs as you move off into Georgia.
Ben Davis: And yeah next slide.
Ben Davis: So if you take that map and you look at a cross section of it, you can actually see the overall extent of the database complex and how it's sitting on top of its back our base on.
Ben Davis: rocks in the danville complex experience metamorphic temperatures, ranging from 650 to 100 degrees C and about six and a half kilo bars the backyard basin units only experienced temperatures from 566 16 degrees see with an accompanying metamorphic pressures of five to seven.
Ben Davis: To a point to kill bars additionally rocks in the underlying Eastern blue Ridge no black or groups were treated by middle ordovician to salary in aged as type select granted toys that are not intrusive into the database complex itself.
Ben Davis: That ava complex forms the hanging wall of the katie couric stonewall line fault system, which represents a ramp on flat style of faulting that can be traced from the Gulf coastal plain on lap and Alabama to the north central Piedmont of George.
Ben Davis: Alright next slide.
Ben Davis: And so, if we dive into more of the metamorphosis.
Ben Davis: We have looked at a number of things, the youngest Platonic rocks and the complex have experienced peak metamorphosis integrated around for 60 to.
Ben Davis: The oldest post metamorphic futons are roughly data between 337 and 297 million years ago.
Ben Davis: If you come down the best general estimate of time, if you look at all the different types of rocks between our for peak metamorphosis was roughly around 400 to 337 million years ago devonian early mississippian acadian too early allegheny him.
Ben Davis: And we dated a number of.
Ben Davis: units and the table complex, including a lot of the fell 6000 Platonic rocks the candle Granite we.
Ben Davis: were able to get zircons out of it and updated those to be 440 6448 plus or minus 2 million years ago China soft concrete Nice as a tad older for 61.
Ben Davis: plus or minus four which actually synced up really nice with the work that ceiling kish did in 1990 with the Franklin nice that's the equivalent to the China safka when they did whole Rocker barium strontium.
Ben Davis: The curricular shifts we were able to get a number of Titles are cons out of it.
Ben Davis: ranging from 463 two 1.3 billion, the highest peak centered around a billion, we were able to get similar to try to zircons out of a Meta seminary rock within the ropes creek.
Ben Davis: closer to the Alabama Georgia state line and, ranging from 26 to 1.6 billion.
Ben Davis: The ropes creek fell site it's a national air within the the ropes or the template itself it's in circulated within it we're going to talk about that a little later on today, we were able to get zircons out of there, although there was some discordance.
Ben Davis: It produced an age of 444 plus or minus four it's also interested by the capital, which we know we have a solid age on that, so it kind of brackets that that age constraint.
Ben Davis: We were able to get obviously knows their cons out of the ultra maverick rocks but you looking at you know some Miriam neodymium systematics.
Ben Davis: produced it to conduct age, which we'll talk about later it's also interested by the chat software creek nice so there's another age bracket there.
Ben Davis: But zircons ages suggest a significant link to the conical rajini with sediments sourcing from the larger margin, and I believe, with that we are just about out of time, and I think we're going to do what questions that yeah.
barineau_clinton: yeah, so I would encourage anybody has questions feel free to type them into the chat just to let everybody know we are coming up on our first official break I know.
barineau_clinton: i'm sure that Jim and and or been or I will be here through the break and happy to answer questions before we jump into our first field trip stops.
barineau_clinton: But we will have a break here in about five minutes so been any questions in the chat or, if you have a question feel free to unmute your microphone and ask.
Ben Davis: I see no questions in the chat.
See.
barineau_clinton: If anybody has a question by all means feel free to unmute your microphone feel free to type into the chat If not, then we'll we'll have a 15 minute break instead of a 10 minute break.
Jim Tull: um did you want to put up those virtual donuts for the break.
barineau_clinton: yeah that's right.
Mary Beth Lupo: They are you the one who using the mouse for everybody else's presentations.
barineau_clinton: I could be.
Mary Beth Lupo: you're doing an exceptional job at.
Mary Beth Lupo: tracking what they're talking about.
barineau_clinton: I have to make up for the you know what's gonna happen when I start talking about my stuff so.
barineau_clinton: i'm trying to build goodwill.
Jim Tull: A.
mark carter: Very good job I like I like the fact that all can expand much more than 15 to 20 minute.
mark carter: timeframe of have a GSA talk to y'all really did a good job of describing the geology down there.
barineau_clinton: Well then, i'll say again it's that first this first part is like drinking from a firehose So hopefully we can slow it down a little bit as we start hitting outcrops.
Willis Hames: i'm looking forward to the outcrops and I do have a question I think I have questions for Ben and for gym but an earlier one sticks in my head.
Willis Hames: To be shown pictures of ribs might have a forming strata graphically above the unconformity and we see some rocks that are more luminous then we tend to see for politik rocks below the unconformity i'm thinking about.
Willis Hames: mineral bluff being so much more luminous than.
Willis Hames: The Dean, most of the information, perhaps and Nana hail, and things like that so.
Willis Hames: what's happening in a successor base and to give what some might wonder, are they turbo nights and there may be some distal luminous rocks that ultimately lead to some high illuminati lights that are not super common in the southern appalachians really in my head what what's the.
Willis Hames: sediments illogical tectonic transition that favors things like that, if you agree.
Jim Tull: You know first, first of all let me congratulate you for running a really good meeting under difficult circumstances.
Jim Tull: If if you're like me you're you're never going to do this again and until you forget about and then you might do it again, but thank you, thank you and your committee bill for doing this everybody appreciates it and it's it's gone well, thank.
Jim Tull: You you know, one of the things.
barineau_clinton: Though it's amazingly saying for someone who just finished up this session this meeting.
Jim Tull: yeah one of the things that's happening bill is.
Is we're sourcing basement.
Jim Tull: And we're sourcing weather granites so there's there's a lot of fells bar is probably changing in the clay is we're going through this.
Jim Tull: transition.
Jim Tull: You know and we're below you know we clearly are eroding below the carbonate bank.
Jim Tull: Both in the blue Ridge and.
Jim Tull: And in the talladega bell and you know there's plenty of sources of.
Jim Tull: Political material in the great smoky group and the show how a group and so forth, so I don't know where that that helps at all.
Jim Tull: You know you've looked at it, the highly luminous rocks in the in the mineral bluff but there's a lot of.
Jim Tull: Gray lackeys and you know dirty sandstone and things like that in there as well, that you know not are not as abundant but clearly it's a mixed bag of sentiments.
Jim Tull: And they're also count curious sentiments in there and in all of these basins so they're they're also sourcing to try to carbonate.
Jim Tull: built.
Jim Tull: That new.
Willis Hames: For you yeah that helps and.
Willis Hames: I think that's probably a.
Willis Hames: largely a function of my focus and and the earlier.
Willis Hames: stops that you showed make me want to do a float trip of and see some of those dynamic tights that that looks really spectacular there's there's a lot, a lot of work to do.
Jim Tull: Those are Those are some of the most spectacular dynamic tags.
Jim Tull: That i've ever seen, and you know that i've been asked if they're if they could be glacial I don't I don't really think those are.
Jim Tull: moraines or anything like that, but I think they're deep water submarine fans.
Jim Tull: But there's they're sourcing fault scarves and we don't see those faults carps those are cut by younger faults.
Jim Tull: And they're probably reset amended sediments so they're mixed all the way from the carbonate bank into the basement in terms of the class.
Jim Tull: But they're really spectacular like you say.
Willis Hames: that's very cool.
barineau_clinton: We are officially.
barineau_clinton: On like I said at a 10.
barineau_clinton: minute break so For those of you that want to take a 10 minute break have at it and we will will restart.
barineau_clinton: At 1210 but like I said I know that uh that Jim and Ben and I will will be in and out on the break and you're welcome to ask questions.
barineau_clinton: Yes.
barineau_clinton: Oh, you better hurry doing.
Beth McClellan: i'm good, how are y'all.
barineau_clinton: it's good to see you.
Beth McClellan: good to see you quote Unquote.
barineau_clinton: Yes, yeah.
Beth McClellan: um what are your first stop is going to be, I have to run out for just a little while and kind of decide when to.
barineau_clinton: yeah first off we'll be in the talladega bill and then we'll go from there into the eastern blue Ridge probably after lunch and and then end up in the Piedmont so first also being laid down and then after that we'll go to.
barineau_clinton: Both gap and then we'll see how far we get since we are we're technically already behind schedule, so we may skip over some stuff that will will eventually end up in the talladega group, maybe, and then do the hillbilly and then we'll cross over to the eastern blue Ridge.
Beth McClellan: Okay i'll try to stay for that and then take a little drink okay.
barineau_clinton: yep absolutely.
barineau_clinton: So speaking speaking of running behind him and I don't know if you're still there y'all stepped away.
Mary Beth Lupo: And in this room now.
Jim Tull: So.
Jim Tull: i'm here, although i'm not showing up there.
barineau_clinton: Okay, all right so.
barineau_clinton: I was just going to tell you all I you know.
barineau_clinton: Of course, we were concerned about this, but I think we're gonna have to decide at some point what stops we maybe want to skip over it so.
barineau_clinton: I don't know that we'll get to all of them.
Jim Tull: Okay.
barineau_clinton: So we should we just go ahead, until one has planned.
Jim Tull: So yeah.
Jim Tull: Okay let's try and i'll try to you know my talk really fast clint here's the one that held us up there, I think.
barineau_clinton: starting to turn start turning the music up loud, or when I was on.
Mary Beth Lupo: An impressive amount of words in a very short amount of time, Dr tall.
barineau_clinton: yeah you know.
barineau_clinton: We would expect no less.
Jim Tull: Money New York accent.
barineau_clinton: yeah.
Mary Beth Lupo: Doing like the Google earth stops after this.
barineau_clinton: yeah absolutely so we'll jump into Google earth after this and start going stop the STOP So hopefully our field trip attendees got an email from me for anybody still out there that should have an email, for me, and it does have a kind of an overview of the trip.
barineau_clinton: And, and you know information on the various stops so.
barineau_clinton: And, as I said, anybody that wants it is more than welcome to email me and i'll be glad to share a field trip got books with them so.
barineau_clinton: Jim have been just to make sure we're on the same page so we're gonna we're going to forge ahead and then maybe reevaluate and During the lunch hour is that reasonable.
Mary Beth Lupo: And shaking his head yes.
Jim Tull: Okay, I think so yeah okay.
barineau_clinton: All right.
mark carter: damn quick question for you the dime a tie, on the hypocrisy river you think that's a that's fault related to.
Jim Tull: The you mean is a dynamic type fault related I don't I don't follow your question, I think I think these things are being shed from fault scarves to get the basement to the surface.
mark carter: right there right there.
mark carter: that's what I mean.
Jim Tull: yeah yeah and I think those are normal faults I don't think that I don't think thats related to thrusting but, but what what's happening is they're piling up.
Jim Tull: In marginal deltas mixing with class from the entire section and then, when we see the debris flows when they see the rocks that we're seeing now those are totally mixed, so I think I would call those resettlement ID sequences where you're able to mix class from the entire section.
mark carter: How close.
Jim Tull: But they're proximal I mean.
mark carter: Right.
Jim Tull: Right yeah their props will there they you know that you get boulders up to almost two meters in length.
Jim Tull: They have a move very far.
mark carter: yeah i'm just trying to think of where that fault would be in relation to.
mark carter: To all that stuff that I map down there.
Jim Tull: yeah it's it's the southeast I mean that the these normal faults had bounded this based on where the to the southeast I think the ones that Mary beth.
Jim Tull: worked on in the blue Ridge, the source of the maggie's mill and what we call the Jacks river in the ever since in Korea more probably source from the Northwest.
Jim Tull: So these successful basins I think we're forming in some kind of an external environment.
mark carter: Right okay.
mark carter: Mary beth you were muted you're still muted.
Mary Beth Lupo: Oh mark.
Mary Beth Lupo: Has a paper I think it's around 2007 he has some seismic data, where he's traced some basement scale faults and if you pull up the Western blue Ridge back I think about 150 kilometers using like some Thomas and bonus data.
Mary Beth Lupo: The Western blue Ridge, the rocks that you and I both worked in it restores just south east of those really large basement faults.
mark carter: Okay.
Mary Beth Lupo: So we're kind of playing around with that being.
Mary Beth Lupo: Maybe some of the.
Mary Beth Lupo: source or being like the source of offset that exposes and basement up through cover.
Very good, thanks.
barineau_clinton: All right.
barineau_clinton: Jimmy backwards.
Jim Tull: I just had a virtual.
barineau_clinton: yeah I can hear.
Jim Tull: Nothing like a virtual don't i'll.
Jim Tull: say that for.
barineau_clinton: Like today.
barineau_clinton: All right, well, I guess officially our break is over, and so we're gonna go ahead and jump into our first stop and so i'm gonna share my screen with everybody, since I get it all hooked up here.
barineau_clinton: Right.
barineau_clinton: So hopefully everybody can see.
barineau_clinton: Google earth if you can't let me know, but hopefully it's there it's all good.
Jim Tull: yep good we can't.
barineau_clinton: All right, no.
Jim Tull: No.
barineau_clinton: Wait okay hang on figure out what's going on.
barineau_clinton: I would think, but now have.
Jim Tull: Our second.
barineau_clinton: All right, hang on, I think, maybe it's just a delay on your side Ben Can you see it.
Ben Davis: yeah I got it on my side.
barineau_clinton: Okay, all right, I think it's just an Internet the light, but hopefully it'll show up.
barineau_clinton: Alright, so I hope everybody recognized recognized as the southeast from us, just a quick our field trip.
barineau_clinton: All of our stop flying and area that are primarily in Alabama but also stretches into Western Georgia.
barineau_clinton: And so we'll we'll zoom in there.
barineau_clinton: it's our very first stop.
barineau_clinton: Is over here in the western end of the of the field trip region very near the Community a jumbo Alabama.
barineau_clinton: So zoom in there.
barineau_clinton: and
barineau_clinton: So jumbo was right here very small community in our first off is just to the east of that and it sits on on a Ridge and i'm going to show this region, the.
barineau_clinton: In my next slide if I can find it let's try that all right.
barineau_clinton: Here we go so hopefully you guys can see PowerPoint slide now so So this is the outcrop we're going to be looking at there's there's the Community a jumbo.
barineau_clinton: And so that's kind of road eight and right here this this rich really laid information that sits on top of the jumbo double my the silica mirabelle and i'll show geologic map here a moment.
barineau_clinton: We have actually a little cave in here just off of yellow leaf creek that's from a dissolution feature in the in the the jumbo dolomite.
barineau_clinton: And proportions of that rich or actually held up by the lady information, while the the units below it that we're seeing here are our members of the silica marble.
barineau_clinton: So if you walk up the hill there and get near the top there's a great exposure and of the unconformity itself it's one of those rare places where you can literally put your finger on the unconformity.
barineau_clinton: and basically it separates rocks of the overlying lay down information from rocks of the underlying silica mirabelle.
barineau_clinton: And so there's that boundary again the tip of the hammer is basically sitting right on it, and if we look above that boundary what we'll see is.
barineau_clinton: Some of the same kind of dynamic diets that Jen discussed and i'll show some some other images here in a minute, but this is basically a call right so Sarah site matrix.
barineau_clinton: Typically matrix supported.
barineau_clinton: But with with class to varying size and varying mythologies that you can see, showing up in this this image here.
barineau_clinton: On a on a on whether on a unbroken outcrop, especially the more courts rich mythologies tend to give us positive relief on it, and so you can actually make out some of the class in these images.
barineau_clinton: If you break open a fresh piece of this, you can find everything, ranging from kind of Hilton San sighs all the way up to kind of granular pebble size so there's a nice little courts class in this and there's some other class over here.
barineau_clinton: Including, this is a there's a hand lens for scale, including a nice boulder sized piece of basement so as Jim is Jim noted.
barineau_clinton: The.
barineau_clinton: These these really granular face he's based in class were dated by Roy them and came up with good grenville ages So these are.
barineau_clinton: These are these were taken down the green light faces they were part of the grim grim billion basement and so whatever this lay down basin was sourcing it had to have exposed underlying basement and we'll talk about the significance of that at this stop and the next one.
barineau_clinton: But, but again very poorly sorted good good diet MIC nights in this region now.
barineau_clinton: along this boundary and we can see here the the Gray line here with the little hash marks on it is the subway damn unconformity so the lay down formation, is to the south of the boundary.
barineau_clinton: And for the most part, though subway damn unconformity in this particular area has eroded, all the way down to the catchy mountain group.
barineau_clinton: At the base of the talladega bell strata graphic structural base of it, but in this section there's there's small preserved regions of the of the in this case jumbo dolomite in the silicon mirabelle.
barineau_clinton: That said, immediately below that unconformity and so a number of workers has for pet proposed there is actually a major fault between the overlying lay down and the younger silica marble catchy mountain group.
barineau_clinton: And so that's I think it's an.
Jim Tull: Older claim.
Jim Tull: begins, you said you.
barineau_clinton: yeah so the yeah the older so look like a marble in the in the younger lady information or or even older catchy mountain group I proposed, this is a fall and so.
barineau_clinton: In an attempt to to address that one of the things we did was we wanted to.
barineau_clinton: do some kind of quantitative work on that boundary, and so I think one of the struggles, we use geologists often face is when you see evidence for defamation evidence for strain in Iraq.
barineau_clinton: it's the significance of that and because we know strain of course is associated with faulting.
barineau_clinton: With sure zones and but also with kind of regional dynamic thermal metamorphic ISM and so attributing that strain to a specific event.
barineau_clinton: or a specific fault or not a fault or folding whatever happens to be can often be challenging and so one of the things we decided we wanted to see here was.
barineau_clinton: If, in fact, there was a major fault that separates the lady information from the underlying silica marble and catchy mountain groups.
barineau_clinton: Then we should be able to identify a strain gradient as we approach that boundary so a student of mine back in 2008 and nine and 10.
barineau_clinton: We worked on this boundary and we basically and as same outcrop I just showed you along with some outcrops, on the other side of the stream that breaches that Ridge.
barineau_clinton: We collected samples that were systematically immediately on the boundary and again this is one of those places where you can actually put your finger on it, so we we took samples at the boundary.
barineau_clinton: And then we took samples systematically further and further away from the boundary.
barineau_clinton: made them sections and then took those 10 sections and in did or a fee analysis on the courts grains and so you can see lots of abundant courts.
barineau_clinton: In these rocks, and so what that analysis showed is when we looked at the the rfp plots and so here's kind of RS, which is the aspect ratio for the string lips.
barineau_clinton: On our X axis, this is the excuse me, the flux fluctuation or variation in orientation of along access to those grains.
barineau_clinton: And what we see that as we go from immediately above the basal contact So this was taking on that contact.
barineau_clinton: The second one six feet above the contact 25 feet above the contact in 67 feet above the contact, so we really don't see any difference in strain, as we move above that contact and, in fact.
barineau_clinton: If we go a little further and look at the the the three dimensional aspect of the destroying lives in these areas it's pretty much all flattening strain.
barineau_clinton: And so the absence of a strain gradient coupled with overwhelming dominance of flattening strain and as Jim has pointed out, and you can actually see it in some of these places is.
barineau_clinton: is very localized relief on that surface is far more indicative of an unconformity than it is with a fall now.
barineau_clinton: Certainly there's no doubt that there is are places where there's concentrated on that contact and so, in some regions that unconformity may be locally faulted.
barineau_clinton: But the relationship between the ladies information as evidence here stop one and the underlying silica mirabelle and there's a bit of that jumbo dolomite and underline catchy mountain group.
barineau_clinton: is far more consistent within the conformity than it is with a fault or, again, you could argue that in places it's a fault in unconformity.
barineau_clinton: So that's a we're going to see more delay damn it stopped to but i'm happy to take questions.
Jim Tull: yeah every everywhere it's also younger or older yep that's exactly right.
barineau_clinton: I can see more more as his hand up feel like said feel free to unmute your microphone and ask or or type of type something in the chat so it won't go ahead.
mark carter: hey, I just wanted to know, do you have the precise age for lose a basement class off top your head.
barineau_clinton: Jim.
Jim Tull: yeah they're there I think around 1.1 billion.
mark carter: Okay, so there we really can't.
mark carter: assign them to French broad or glow.
Jim Tull: No.
Jim Tull: No yeah that's.
mark carter: Not outliers are.
Jim Tull: Well that's a good question you know, there really hasn't been that much cirque on work done on those graduates.
Jim Tull: it'd be nice if we could do more, but when I when I first, before I went to fsu Roy TIM had been a colleague of mine at at the University of North Carolina when we were when I was an undergraduate and.
Jim Tull: graduate students, so he was at fsu and I brought him out here and told him I didn't see how these class could be anything but greenville.
Jim Tull: And so, he did the zero con work and but that's you know there's a lot of grant different grant toys in there there's actually some we found a few Meta gab rose class in there as well, but.
Jim Tull: yeah there's there's probably a lot of zero con work, it could still be done on those graduates.
mark carter: yeah just be interesting to nice to see if they're actually representing some other.
mark carter: Southern appalachian the CIF that may have a different age range than what we already see and bit further to know the facts.
Jim Tull: you're right, but you know we're pretty close we're up on the CRATE on here, you know we're the carbonate bank.
Jim Tull: is still fully developed here, so this would be, you know as as not as probably distal is even the massive send the blue Ridge.
mark carter: yeah that's true that's true.
barineau_clinton: Any other questions on this stuff.
barineau_clinton: Alright well are there no others then we're going to go to our next stop.
barineau_clinton: So back out here.
barineau_clinton: So our next stop is actually not too far away and again it's still in the late damn and we felt like this was a good opportunity.
barineau_clinton: To show some of these relationships so we're going to look at one of those lower dynamic dykes here just above the same boundary that we saw it stopped stopped one.
barineau_clinton: So this is a just below lay down, and so you can see the dam there and its own category 55 and so will drop in here, just so we can take a look at what that.
barineau_clinton: That outcrop looks like and where we have access to it i'll show you guys street views of what these outcomes look like, but.
barineau_clinton: This is a really spectacular exposure to grown up a lot over the years and so it's probably not as good as it used to be, but there's still a lot of great stuff to be seen here so.
let's see if I can find it there, we go.
barineau_clinton: So.
barineau_clinton: So stop to write this is from a previous field trip guidebook but stop to is here, I don't lie don't lie damn this was this was stopped one which was stopped six in that field trip guidebook.
barineau_clinton: And so, will drop in here, and what we can see are the the this pattern right here.
barineau_clinton: These are the dynamic diets and so we're looking at one of those dynamic diets that's a couple of layers up from the unconformity itself and the value of looking at this outcrop is when things that can show us is you know what exactly was that late damn basin sourcing.
barineau_clinton: So, again spectacular exposures the fully ation is a is is a dipping to the southeast.
barineau_clinton: This these are massively bedded and so they're they're basically boundary units.
barineau_clinton: And so it's it's it's hard to find a lot of fine grained bedding primary layering in there is some evidence that that primary layer here is parallel to the affiliation, but again, most of these are just massive submarine landslides of some sort.
barineau_clinton: And we see a lot of the classes that are present in there are basically bank courts, and I will see some large boulders of ain't courts and so that's a that's a fairly common mythology the matrix itself is is a fine grained core sites parasite matrix that probably represents the original.
barineau_clinton: politik matrix in which these larger grains were supported it's also possible a lot of those were immature grains that were subsequently broken down during died genesis in in probably not not dissimilar from some of the debate, set of intelligence have about about grain supported rocks.
barineau_clinton: This is a class of a marble.
barineau_clinton: And so you can see it's it's relatively rounded of courses have been flattened some and live illogically these classes are very similar to the underlying silica marble and so again going back to some of those those arguments that there's a fault at the base of this.
barineau_clinton: If so, then wherever the space and was seemed to be sourcing a lifestyle is still look a lot, like the silica memorable so this looks like it's sourcing the underlying sure tigger fee there.
barineau_clinton: We can also see mythologies like this, this is basically a a medications court site, it looks very similar to with allergies, we see an underlying catchy mountain group.
barineau_clinton: Here we have a very large boulder size courts Fein President this outcrop and as Jim has pointed out, this is one of the places where we have a relatively you know large boulder of.
barineau_clinton: granular nice right which isn't again interpreted as credible basement exposed to this area, you can see.
barineau_clinton: The the mineralogy of it is at much higher grade and the surrounding core exercise with allergies, of the lady information.
barineau_clinton: And you can also see in it the fabric, the the original fabric in this rock is is this coordinate with the overall fabric in the surrounding.
barineau_clinton: host rock or the detritus that, in which it wasn't trained and so clearly this this experience its own earlier metamorphic event and that's very consistent with the idea of it being a gimbal basement, of course, the ages on those grindle classing to back that up oh.
barineau_clinton: alright.
barineau_clinton: So, again in the the idea, there is this dynamic date seem to be sourcing and i'll back out the dynamic seem to be sourcing.
barineau_clinton: Basically, all of the level of theologies that we see an underlying lay damn excuse me, the underlying a catchy mountain and silica mirabelle groups.
barineau_clinton: Plus grenville basement and so when we take the total thickness of those units if we think about how, how do you bring those to the surface, because to source the galaxy mountain.
barineau_clinton: You basically have to you know get it out from underneath the silica mirabelle if you want to then source to greenville basement and we do not have any grumble basement in place right there is no.
barineau_clinton: You cannot find the unconformity between the catchy mountain and underlying greenville basement assuming that's what was originally underneath it.
barineau_clinton: Because the structural base of the talladega bell and the catchy mountain group is the talladega carter's will fall.
barineau_clinton: But this requires several kilometers of uplift to breach that full strategic fee of the catchy mountain, plus the silica mirabelle.
barineau_clinton: and expose the basement underneath it, and so the age on the lay down is important because it is, it is clearly telling us that there is some tectonic activity.
barineau_clinton: To produce those faults and of course we can certainly debate whether or not it's thrusting or normal faulting or something else but the.
barineau_clinton: The most reasonable explanation for getting all those rocks the surface is we're looking at an interval of extension.
barineau_clinton: In which we have a normal fall exposing the underlying catchy mountain silica marble grumble basement and dumping it alone these these large uplifts into a low lying basin if we think about the age constraints on this, we know that, first of all it's strata graphically tied.
underline silicone.
barineau_clinton: which carries us into the ordovician so um has to be at least or division, but we also have post or division counted on cast that new Harris got out of it.
barineau_clinton: Suggesting it's it's probably older than or division and, of course, the other constraint as we'll see at our next outcrop.
barineau_clinton: Is that the overlying cheol courtside and budding rams sandstone they have good early mid devonian fossil assemblages.
barineau_clinton: And so the age on the late information, therefore, is either early devonian or potentially latest solarium and so we're looking at a period of tectonic activity.
barineau_clinton: that's that's not widely recognized in the southern appalachians especially until we started dating.
barineau_clinton: Some of these protons in the eastern bluer is, but what we're all hope this show you later, is that we looks like we have some slurry and pollutant ISM in terrain that we believe to be just outboard of the talladega bell during the roughly the same period of time, so.
barineau_clinton: happy to take questions don't stop to or if jimmer been have comments go go for it.
Jim Tull: yeah.
Jim Tull: I wouldn't be surprised if it's a whole series of normal faults, instead of just one one fault but, but nevertheless it does the same thing yeah.
Ben Davis: This was the STOP where we had the encounter with the the guy in the truck yes.
Ben Davis: It was.
barineau_clinton: So good rainy day in Alabama with the locals stopping to ask us what we were what we were doing so.
barineau_clinton: Any questions on stop.
Ben Davis: By we got a question here in the chat okay.
Ben Davis: clint you're referring to slurring devonian extension all tectonics.
barineau_clinton: Basically, am I think we're seeing we're seeing more and more evidence in the eastern blue Ridge, and again we feel like that that more and more, the overall story is showing us if we look at the.
barineau_clinton: synthesis of all the data we're seeing more and more that there seems to be in a series of extension or contractual events going on just outboard laurentian margin from the ordovician at least into the early solarium.
barineau_clinton: And we would argue that that's very, very possible we're seeing it into the late salary and and we're we're working on some manuscripts now that I think are gonna help elucidate some of that.
barineau_clinton: But, but this is a this is, you know indicative and Jim Jim worked on this long before we started thinking about a backyard backyard tectonics.
barineau_clinton: and basically it comes conclusion that the most logical explanation for the lady information was some sort of external tectonics.
barineau_clinton: At that point, I think the that Jim would probably be the first admit that was kind of isolated in terms of our our data points for this.
barineau_clinton: For that extension event but we're starting to see more and more evidence in the southern appalachians of really a prolonged interval of extension possibly punctuated by contractual phases.
barineau_clinton: And really just for for continuous origin of activity alone, the margin, instead of these kind of discreet pulses that we've typically attributed to appalachian or genesis.
Ben Davis: Thank you.
Beth McClellan: Tom mentioned the old saying you haven't found anybody found any volcanic class in the lay down.
barineau_clinton: You know there's something we thought about lot beth and I think you and I have had some of these conversations.
barineau_clinton: First of all, if they one of the problems of course with volcanic class, especially in in rocks like this and having conversations with sentimentality has been very useful, a lot of those volcanic class, you know if they're, especially in mature.
barineau_clinton: They they get destroyed during died genesis and they simply become the matrix and so having conversations with people like Neil lumbered.
barineau_clinton: who's worked in in Taiwan and other areas on on great wacky and things like that and he's pointed out that that many of these kind of matrix supported lackeys.
barineau_clinton: Probably originally had were in some cases grain supported and a lot of those grains are relatively immature volcanic and other.
barineau_clinton: easily weather material that broke down during genesis to give us a matrix, so in that sense we haven't found any anything that.
barineau_clinton: That I would think of as being a volcanic class and maybe Jim has, but I think there's potential there, especially at the base of the lay down formation to do some work on work, because I think if there were if we were eroding.
barineau_clinton: into the base in Koh evil, with some extension tectonics very possible that we were sourcing.
barineau_clinton: Some some volcanic that potentially zircons might have been concentrated in those, and so I think there's some to try to work on work in the in the in the late damn would probably really valuable.
Jim Tull: yeah.
Michael Thonis: Are there any major conglomerates.
barineau_clinton: yeah so I mean that's basically what these are is that is that what you referred to these these.
Michael Thonis: Well i'm thinking of something coarser than this, I mean, these are.
Michael Thonis: These are not, I mean, these are.
Michael Thonis: These are more like as you described class in maybe maybe class in an underwater.
Michael Thonis: You know landslide slide.
Michael Thonis: Which is different than that which is different than a maybe then, then a.
Michael Thonis: conglomerate fan that you see off a rift off the side of riffs that may be still burial.
Jim Tull: yeah the the there are conglomerates, in addition to these dynamic types they're really spectacular holly felt by ethic several 10s of meters thick and places.
Jim Tull: But I think these are all marine we don't see any evidence that there's.
Jim Tull: terrestrial settlements in here.
Jim Tull: Back to that other question I you know, in terms of sourcing volcanic so the only one, the only thing I could think that would happen is you might go through the blunt.
Jim Tull: Section if it existed down here with Ben lights, but we do find is, I think I mentioned may fake Platonic rocks that are probably grendel or medigap rose in there a few medigap road class that we found.
Thanks.
barineau_clinton: For the questions on thought.
Michael Thonis: i'll just make the observation i'm familiar with the comics up here in New England and I will.
Michael Thonis: Which is.
Michael Thonis: It you know any remarkably similar to what you're describing in all ways.
Michael Thonis: And it's similar in a similar setting to what you're what you're suggesting.
barineau_clinton: A number of people have have have argued for the lady damn to be that the content classic wedge, which is.
barineau_clinton: Why we go back to that that debate over what is the base a little a damn and I think at this point, most people who were down here in the bell and it worked on that boundary and mapped it and and looked at the relationships on both sides, when you take into account.
barineau_clinton: You know the the the strain, the type of strain the magnitude is trying to cross the boundary I think you're left with a conclusion that okay in places it might be faulted.
barineau_clinton: But it is it's basically a faulted unconformity and so that fault didn't really do much to it, and so, at that point you're left with the age relationships and again.
barineau_clinton: You know if we if, in the absence of the continent molds.
barineau_clinton: Then you know you definitely could ask some questions about what could it could it be the ordovician classic wedge, but I think is as Jim has pointed out, and I agree with them.
barineau_clinton: You know, obviously this is really rapid deposition right, and so the the entire thickness of the late damn which is kilometers thick.
barineau_clinton: was probably really, really, rapid and so, if you recognize it right above that you have a nice transitional contact with clean court sites that will see this next outcrop.
barineau_clinton: Clean court sites of the budding Ram and chill court site, and of course they have really good early middle devonian funnel assembled is in them.
barineau_clinton: In this you know this, basically, is instead of graphic contact with with devonian rocks if the Holy damn was deposited very rapidly.
barineau_clinton: it's kind of hard to get it back into the automation at that point, especially if you couple that with the with the Commandant so and i'll let Jim add that or anybody else that wants to.
Jim Tull: yeah what we can get into that later let's move on.
barineau_clinton: Okay, all right.
barineau_clinton: Okay.
barineau_clinton: Then i'm gonna.
barineau_clinton: turn this back over to you, Jim let me find your talk.
See there it is.
Jim Tull: yeah go to the next slide okay there we go.
barineau_clinton: Well let's see before I do that, let me let's let's let's show our show where we are relative to.
yeah.
yeah so.
barineau_clinton: So here's our filter region again and so again to keep everybody you're roughly where we're at we're gonna hit stop to over here we're going to travel a period of balls gap due east of silica.
barineau_clinton: And we're going to go to filter filter up top three.
barineau_clinton: And you can see the trace of the talladega mountains here, and that is the CIO courtside jim's about the talk about.
barineau_clinton: Stop three actually has a couple of different parts to it and so we'll start here, right at the crystal bowls gap right on the the GL Ridge itself, and this is a nice kind of northeastern view right down that Ridge so.
barineau_clinton: All right, so Jim will see you again there you are, and.
Jim Tull: Next slide yeah one more time listening right.
barineau_clinton: You know I got i'm fighting with my computer with too many PowerPoint presentations right.
Jim Tull: Okay, so this is a radar image of the area that that we've been talking about, and you can see the talladega mountains there and stop three is a gap through.
Jim Tull: That Meta sandstone sequence, and then, if you look down to the left is the coosa river and the town of jemison in those ridges south of jemison are the budding Ram.
Jim Tull: courtside and that extends up into the area that we're talking about here, which is the CIO courtside So those are those are equivalent units and they both sit on the lay down information so next slide.
Jim Tull: So this is a series of panels that I put together from the coastal plain.
Jim Tull: Up to the Northeast near the.
Jim Tull: Georgia border.
Jim Tull: And you can see the budding Ram courtside and the jemison shirt overlying the late information on the far left and then, when we get to this stop at bulls gap, we have the CIO courtside overlying the lady information.
Jim Tull: Once again, and then this is what I call a starvation basic sequence above that is the shirt and black shale sequence, so this this sandstone sequence goes up to in some cases, several hundred meters thick.
Jim Tull: And it kind of cleans up the lane damn it's it's go to the next slide.
Jim Tull: Well it's a it's a hard back Ridge, the you get a cliff face to the Northwest and basically the slope on the southeast as a dip slope next slide.
Jim Tull: So these are mainly mainly coursera nights years ago, I had a master student bill quarter that worked on the GL court site, and you can see his modes on the different sub units and that he mapped.
Jim Tull: Very little fells bar, there are some cobbles at the base, you know that are found in the budding Ram.
Jim Tull: That are granted cobbles so locally that could be an unconformity between that and the lady damn but basically it's a continuous unit that runs from the coastal plain all the way, almost into Georgia next slide.
Jim Tull: It has a lot of primary structures in it, these are low angle cross beds.
Jim Tull: At bulls gap or very near bulls gap there also channels that you can find so there's a lot of facing data that you can get out of these rocks but there, there are there coursera nights very clean next slide.
Jim Tull: build it some modes on a few cross bands, you can see there's what looks like longshore.
Jim Tull: directions and then perpendicular to that is a bleak to shoreline.
Jim Tull: modes next slide.
Jim Tull: There conglomerates in there and they're mainly vein courts pebble conglomerates regionally the defamation is when it started talking about earlier there, there are.
Jim Tull: A long vacation when the Asians in these units stretch pebble initiations and so forth, and they're regionally persistent next one.
Jim Tull: More stretch pebbles in the conglomerates of bold yeah next slide.
Jim Tull: This is bill carter's panel that shows.
Jim Tull: This bull gap section, starting at the base, which I really can't see very well on my computer back then, the person that had worked in the lay down in the north was.
Jim Tull: Was Danny beer, so you A, B and he called that the heflin fill it back to the southwest at all burn was jack Carrington who called it, the light and formation, I think.
Jim Tull: And so we use that term now, but you can see the really well exposed at the base of that cut road cut the bulls gap, you can see the contact between the cheat hall and.
Jim Tull: And the light damn.
Jim Tull: And then there are middle the middle part of the strategic view there's is where it most of the conglomerates occur and importantly at the top.
Jim Tull: we're going to show the transition into the Aaron slate, which is part of that star based in sequence that I talked about which is strata graphical equivalent to the jemison shirt excellent.
Jim Tull: Now we're going to the top of the key Hall, and you and there's a beautiful series of road cuts going down the dip slope.
Jim Tull: to the east of bull gap on highway 148 towards melville and so you're on the dip slope with these road cuts and you can see the Nice transition with increasing.
Jim Tull: numbers are amount of graphic fill light in her bed with the sand stones or the hall So you see that wherever you cross across the slope of the CIO courtside.
Jim Tull: You go into this great nation with blank slates which are holly carbonaceous and then, finally, the courtside start dying out and you're into just a black shale basin next one.
Jim Tull: I don't know whether we're going to get to this or not, but it further to the north is the type section of the slate it's called the Aaron slate and that was first recognized.
Jim Tull: And if you were listening to bill Thomas yesterday he gave a shout out to Charles butts and said that whenever he thought he discovered something new that he found out Charles butts and already figured it out.
Jim Tull: i've had that experience many times.
Jim Tull: But years ago one of the foreman that the power right minds that pirate and gave butts a.
Jim Tull: lipitor strobe us Cone that he found near pirate and so there's been debate about the age of the air and slate for decades, and that was a Pennsylvania fossil.
Jim Tull: And so the usgs put windows around the Aaron slate and different people still do that today, but it's part of the strategic fee and then years later, Bob castaldo at all burn found a.
Jim Tull: A.
Jim Tull: what's what's that fossil plan.
barineau_clinton: period asked RON.
Jim Tull: Look at it very asked RON, which is a very asked for on which is a really strange plant fossils that.
Jim Tull: is only found a few locations in the world, but Bob thinks that could be as young as coordination and so that's why we argue that the age of this this star base and could go up into the lower most mississippian next slide.
Jim Tull: Okay That just shows more that transition, as we go down slope.
Jim Tull: On the dip slope.
Jim Tull: So keep going clint okay that's that's all I want to say, we can take questions now about the hall.
Jim Tull: Years ago.
Jim Tull: There was a student, I think, from the University of Cincinnati they worked on the hill to be.
Jim Tull: A guy named Griffin that that called it, the Hillary still.
Jim Tull: That reported a chronically in the.
Jim Tull: chalkboard site.
Jim Tull: i've never you know that was never shown in any diagrams or anything but we do have bracket pods that are well preserved out of the battering ram that we found in the jack Carrington reported years ago, so we know that unit is devonian.
Jim Tull: And maybe it goes up into the mississippian in the air and sleep.
Jim Tull: So we'll move on to if there's no questions we'll wait for questions anybody.
Beth McClellan: I just wanted to make a comment, gentlemen.
Beth McClellan: You know I worked in that area, so many years ago now it's it's been a long time, but I still have some instructions from that area and.
Beth McClellan: I can't remember exactly where I collected the sample but somewhere on the boat bulls gap on quadrangle and I was using it in my metrology class just this past week in a metamorphic lab and.
Beth McClellan: You can really see the pressure solution that's causing a lot of the Court screens to be to look stretch, but actually in a lot of cases, it was dissolved from top and bottom yet just kind of interesting.
Jim Tull: yeah that's that's a good point you know the Aaron is the same grade is the rocks below it, I mean it's not in a window, which I think was stolen status originally suggested that because they didn't want Pennsylvania rocks showing up here and, incidentally.
Jim Tull: Many of you know that these fossils that are in the talladega belt the youngest fossils are the worthy youngest fossil south of the Boston basin.
Jim Tull: And I see Mary beth sitting there and there could be devonian rocks in the maggie's mill and the Jacks river in the blue in the western blue Ridge there's certainly slurry and and may well range into the devonian so we can't make that claim any more about the talladega bell.
barineau_clinton: Your questions will stop three.
barineau_clinton: i'm going to just show everybody really quick and Jim jim's already discussed it.
barineau_clinton: just going to show everybody real quick were stopped for is but i'm going to kind of breeze right over and jump in the top five because because of some of the time constraints.
barineau_clinton: So stop three is terrible at bulls gap and stop for is further to the east again along strike but slightly higher in the section so we'll zoom down here.
barineau_clinton: If anybody ever wants to go and actually see where some of those fossils have been recovered from Aaron slight like the paradise non-fossil.
barineau_clinton: This is all thing rock road, this is a railroad cut a few hundred meters alone railroad cut at stop for and there's there's great outcrops there of the air and slate Bob castaldo recover that Perry Australia, which is basically a leaf pity old.
barineau_clinton: from five static nodules that he separated from the Aaron.
barineau_clinton: And so it's basically the stem of a leaf as Jim pointed out it's it's only found in just a handful of places.
barineau_clinton: across the planet but in those places where it has been identified, it is largely constrained to our nation lower most Mississippi and rocks there has been some work in other parts of the appalachian where people suggested it could range down into the upper most devonian.
barineau_clinton: But again, that that's where that outcrop came from, so I mean where the samples came from so.
barineau_clinton: want to jump jump back out here and try to catch up with our schedule a little bit and So here we are in norville and in this location we're going to see two outcrops.
barineau_clinton: Of the hill be greenstone both the greenstone mythologies and the day site with allergies that people like beth mcclellan and others have worked on so so we'll jump in here to stop five.
barineau_clinton: And you can see our next stop stop six is there in the background, and so this is right on the highway between milledgeville and silica and it's one of many numerous outcrops of the hill be greenstone.
barineau_clinton: that's visible well apparently i'm not in the right place, but there we go let's try that one.
barineau_clinton: Everyone remembers outcrops the green stone that are visible along that highway so.
barineau_clinton: i'm going to turn it over to you for stop okay.
Jim Tull: yeah let's go to the MIC there you go.
Jim Tull: The he'll be like I said was there was a thesis done on this back in the 1950s, I think, by University of Cincinnati graduate student Griffin, and this was described early on, by.
Jim Tull: Some of the early Alabama survey geologists.
Jim Tull: It stretches from in layers within the coastal plain, you can see there on the left, all the way up to be can in Georgia so it's got a strike length of over 230 kilometers it continues under the coastal plain.
Jim Tull: And I started working on this back in the early 70s.
Jim Tull: And with Tony another a and in some other people, and we, for a long time felt that this was had a strata graphic base with the underlying rocks.
Jim Tull: And then gail Russell was a graduate student at Florida state was one of them, students and and he asked me to take her to the field when she was graduating at fsu I was at Alabama and Sam sample the day sites, whether because I thought.
Jim Tull: These one blends in the day site, you could get potassium argon ages, out of but she also separated zircons and back then you mass rated a large number of zircons and she got.
Jim Tull: Where division ages so many years, we debated whether that was the true age of the syllabi and then beth mcclellan and us working with Paul Miller started doing more details there come work and we realized that, in fact, this is an order division by modal volcanic sweet.
Jim Tull: it's over two kilometers thick and it has mainly just by modal mechanics it's got a structural base, which we call the hill be thrust, which we think is a pre metamorphic fall.
Jim Tull: And the upper boundary is the hollins landfall, which is a probably a permian fault so go to the next slide shows these shows were stopped three was.
Jim Tull: And at the CIO courtside and then stop five is near the base of the lb and stop six will be in these red units which are large.
Jim Tull: eruptive fallacy rocks.
Jim Tull: next one, this is a close up of one of the.
Jim Tull: One of the crops that that clint just showed on Google Earth.
Jim Tull: When we started working the hillbilly we recognized, obviously, to make the crocs are the most abundant and but they come in a variety in a different varieties their massive in some places, which we call greenstone they're really hard rocks and i'll show you that in a minute.
Jim Tull: And they have a lower Greens his face he's mineral assemblage chloride Actonel like EPA.
Jim Tull: pelagic close.
Jim Tull: And then they become fully aided in more places where there's fluid.
Jim Tull: And so we they transition into rocks that we call mythic phil lights, which have the exactly the same mineralogy except they have a lady cleavage.
Jim Tull: And they have the exact same chemistry, some of those may fill lights are fully green stones and some of them are probably volcanic ash, some of them are laminated compositionally layered.
Jim Tull: Next slide.
Jim Tull: This is just showing you that the apple green pale green green stone mythologies very, very little cleavage penetrating through these things they're they're very hard to sample in many places, but they have a good lyric and basalt chemistry next slide.
Jim Tull: And this just discussing that chemistry.
Jim Tull: We believe that's.
Jim Tull: These are related to external environments involving attenuated I Cardinal cross because of the inner bedded fell sick rocks, and so we believe they have a super subduction signature or volcanic oximeter next slide.
Jim Tull: There are preserved.
Jim Tull: features in there, that are not deformed their basic textures can see pelagic lays labs and Actonel like here, and so this would be what a an uninformed unfolded greenstone looks like in and then section.
Jim Tull: But then, as I say, in much of the area they've been fully edited to various degrees and so we've heard of those rocks as may feel like, but they have exactly the same mineral assemblage excellent.
Jim Tull: For those of you that are.
Jim Tull: anthropologists I thought I would point out that these were the go to rocks for stone axes back in the mississippian of mississippian people about 1000 years ago, or more.
Jim Tull: So these stone axes are found all over the southeast and several years ago, an anthropologist at the university North Carolina contacted me about.
Jim Tull: Trying to relate the things they were finding in various mound builders building people's remains, and they did photography and geochemistry and were able to.
Jim Tull: pinpoint that these axes came right out of these green stones in the hillbilly.
Jim Tull: And there's actually a creek not very far from here, which is called hatchet creek, which is where this name probably originated that's.
Jim Tull: The hatchet Cretin group is actually in the in the ashland supergroup, but if you go to these outcrops and take your students and take a crack hammer.
Jim Tull: You can you can split those things into seltzer stone axes and they are very sharp and they they apparently you could cut trees with them, and maybe you could attack.
Jim Tull: Andrew jackson's troops when he came down into the creek nation next line.
Jim Tull: All right, let's stop and ask for questions on the makeup rocks which are about 80% of most of the closures and, by the way.
Jim Tull: We do not see in the strata graphic base or the strata graphic top of this sequence, so the Hillary just sits there with a with a fault at the top and a fault at the base.
Jim Tull: And I should point out that that fault at the base.
Jim Tull: Is a flat on flat fault over the entire area where.
Jim Tull: The hill be sits on the devonian rocks next slide okay go ahead clip sure where that is.
barineau_clinton: Where we're human go to stop six are.
Jim Tull: You a question must eat.
Jim Tull: Less exercise for questions yeah i'm trying to catch up with Tom yeah.
Ben Davis: there's nothing in the chat.
barineau_clinton: room back out stop six is again just to the west of stop five, and this is a.
barineau_clinton: To South again you're 18.
barineau_clinton: And this is a small creek that runs right by this little mckean road.
barineau_clinton: So short hike up the creek and you'll hit hit a lot of outcrop there again that was part of a previous field trip guidebook.
barineau_clinton: That we're happy to provide upon request, and that was in that synopsis so now.
Jim Tull: Okay, so this map once again is in this is a couple of quads in the middle of rural area and what i've done there show the locations of these fell sick sheets.
Jim Tull: Which which are they sick in composition and you can see the concurrency there i've driven in what we call the hill be thrust in green.
Jim Tull: That is concluded with the football rocks everywhere we see it, it doesn't go below the budding Ram sandstone in that duplex in those duplex horses.
Jim Tull: And then the strategically within the hillbilly also parallels that thrust, you can see clearly from these days like sheets that's also parallel to.
Jim Tull: strata bound sulfide deposits that we see in places like puritan and there's some strata bounce off is very near, this is what we call mcgee he falls that you can see, on this map.
Jim Tull: Just just to the left of stuff off, so these Celtic sheets.
Jim Tull: I think we're ignorant brights they were explosive of organics that covered a huge area and they range up to about 150 meters think.
Jim Tull: There are a number of these, you can see, the two larger ones there and then the lower when you can see, in some of the amber kits on the lower left so we're in that she here.
Jim Tull: At mill creek if you'll go to the next one.
Jim Tull: The show's typical outcrops these rocks are well affiliated.
Jim Tull: they've got a green his face he's mineral assemblage, which is the same throughout the the he'll be here and into into the foot wall below the Hillary thrust.
Jim Tull: These rocks are muscovite or Sarah site courts planted clays.
Jim Tull: Plus Horn blend in these one blend a lot of the pelagic lays a lot of the courts and a lot of the one blend or professional class that we think we're volcanic class, so these were basically crystal toughs that is there were crystals forming in the magma chamber.
Jim Tull: Before it erupted, and then they came out and were broken apart during these explosive eruptions.
Jim Tull: Next slide.
Jim Tull: This is typical typically what these rocks look like you can see these Horn been one blend crystals they've been altered at candlelight in many places.
Jim Tull: But these.
Jim Tull: You can you can retro to form these.
Jim Tull: thrust panels and you can you can fold down these big cross vols like we see in melville and you see that these sheets actually cover hundreds of square kilometers.
Jim Tull: And therefore, they have volumes that are enormous much, much more than things like mount Pinatubo things like that, so these were large large Caldera type of Russian corruptions.
Jim Tull: And they contain these early crystals.
Jim Tull: And they also contain class angle or class of the maven rocks of some of the green stones and they also contain class that look like pumice fragments.
Jim Tull: The matrix was probably mainly glass has been really crystallized into courts muscovite fine grained courts and muscovite and then these professional class which are.
Jim Tull: formed in the magma Chamber are shown here in the slide next slide.
Jim Tull: You can see that the matrix is very fine grain and these Professor class range up to.
Jim Tull: Almost a centimeter.
Jim Tull: And they are mainly m.
Jim Tull: And m football Horn blend it's been altered deck candlelight.
Jim Tull: And then large pleasure clays phoenix Christian places.
Jim Tull: These rocks when you find the contact with them a fake rocks those those contacts or knife sharp so we had my mobile volcanism bring where we had mainly salty.
Jim Tull: igneous activity going on in this area, and then there were periodically called arrow eruptions, and these.
Jim Tull: were partially melted.
Jim Tull: Part of the continent, these zircons go ahead click go to the next one.
Jim Tull: When we were working on this beth mcclellan I think beth is still here I can't tell.
Jim Tull: also started working on the hill Ob and.
Jim Tull: We all did uranium LEDs are con and our work was done with Paul Miller and got ages range from about 462 470.
Jim Tull: But if you look at the.
Jim Tull: The trace element, the happening.
Jim Tull: epsilon units, these things are being derived from much older probably mezzo protozoa billion year old basement so that that signals in there, so we think this is part of a continental margin.
Jim Tull: Volcanic sequence next slide.
Jim Tull: And so, this is this arrived this Rashid this very thin lateral extensive Rashid arrived on to the for land.
Jim Tull: Before metamorphosis and after the youngest fossils whether they're coordination or upper devonian the metamorphic ages, that that beth got the.
Jim Tull: The Oregon Oregon Mike ages, that also bill bill haines and I worked on our around 325 330.
Jim Tull: So this this spreadsheet arrived in the mississippian, and that is the oldest evidence of impressive defamation in southeastern or rent you and so part of that backyard basin is the most proximal part and clint will discuss this later.
Jim Tull: arrived up onto the edge of the shelf on a flat on flat thrust sequence.
Jim Tull: Meaning that those rocks had not been previously deformed to any significant extent and they were not metamorphose that, even though there for 6470 million years old.
Jim Tull: They arrived on the shelf and so then that's much younger than the allegheny and through us that's an early allegheny and that's the earliest allegheny and thrust the base of the lb.
Jim Tull: And then these later through us are probably permian they were talking about the roof thrust is the hollins line that we've been talking about and then to the Northeast there near Buchanan or telcos Georgia it's the altoona.
Jim Tull: Okay.
Jim Tull: I think that's it will have questions oh.
Jim Tull: i'll talk about this for a second.
Jim Tull: The kinematic sequences as a really significant here all of these thrusts.
Jim Tull: Except except for the syllabi are out of sequence, I mentioned the talladega fault cutting fabric and folds and throw us in the foreign land so it's out of sequence.
Jim Tull: The next rest up here is a hollins line, and you can see the Miller ville Anna Anna form there that follows the duplex and that milledgeville folders decapitated just where that white arrow is there, north of milledgeville by the altoona fall.
Jim Tull: Next slide.
barineau_clinton: I think that's it.
Jim Tull: Okay, I thought I had one more in there, but anyway, if I were to go back, which I want.
Jim Tull: The we can we can prove the horns Lon fault is younger than the.
Jim Tull: Tell they carville fall back down towards the coastal plain so as we're moving East from the four land with when we see the.
Jim Tull: The allegheny and arrival of these big metamorphic rock ponds they're all of out of sequence and you're you're looking at them that the largest displacement here on any of those threats and that's this hollins Lon full and i'll stop here.
Jim Tull: Has for questions.
barineau_clinton: So we're we're just a couple minutes out of our lunch break, but I know that Jim and Ben and i'll be more than happy to answer questions into the break but.
barineau_clinton: If there are no questions we'll we'll we'll take a break from 12 to 130 and that will get people plenty of time to go do they need to do, but in but we'll definitely reconvene.
barineau_clinton: At.
barineau_clinton: Well, I guess it let's see it's 110 now so we'll reconvene, and this is Eastern time, so we would definitely reconvene by 230 Eastern time.
barineau_clinton: 130 central time so, but again we're happy to take any questions at this point.
mark carter: I have one question for GM or anybody who can answer it for the.
mark carter: For the accents Has anybody found a native American corey from where those were mind or can you, basically, the idea is is that anywhere in that outcrop belt wanting to go up waffle hunk off and go on.
barineau_clinton: I think, Martin most likely, you know they were just taking advantage of wherever those outcrops happened to be, and obviously the modern ones are road cuts, but i'm sure there were plenty places where string cuts were also exposing those and you can still see some of those today.
barineau_clinton: What was it was amazing to me is, if you go out there and you want to knock off a piece of that and I I have probably.
barineau_clinton: greenstone shrapnel in my body in multiple places, because they will make you bleed really quick.
barineau_clinton: it's impressive to me they were actually able to break those things off and shape them and needs different way and so i'm guessing that maybe in a lot of cases, they were using.
barineau_clinton: You know blocks that are just naturally fractured and broken off and just picking stuff up off the ground so but yeah Jim might have some insights but i've never heard of anybody, you know finding what they thought of as a corey a native American Korean.
Mary Beth Lupo: thunder till you're muted oh.
Jim Tull: The anthropologists think.
Jim Tull: That they came from just the creeks you can go down those creeks like how to creek.
Jim Tull: and find cobbles and boulders and you can take those and throw them against each other and break off fragments and things so.
Jim Tull: You know those guys were pretty good at making tools, back then, so I don't think they had any problem at all and getting them from the creeks I doubt if there are they wouldn't have needed any queries or anything like that.
mark carter: Good thanks.
barineau_clinton: Any other questions.
barineau_clinton: Again, we got a nice nice long lunch break for everybody to your body chance to get out and stretch your legs and so, if there are no questions, we will all reconvene at 230 Eastern time which is 130 central time.
mark carter: clint thanks i'll probably will, when I after I finished lunch i'm probably going to head over to.
mark carter: The other field trip very best I think you're coming with me.
mark carter: So good job I like it.
Jim Tull: Like it a lot yeah thanks mark thanks for coming yeah.
mark carter: hey one more question.
mark carter: Is uh, what do you what is a beating Mary beth gonna do to celebrate bins big accomplishment.
Jim Tull: They were.
Jim Tull: They were hoping, you would send them some of your mcfall brew.
mark carter: yeah I need to get back to brew and i'm not brewed in a while.
Jim Tull: yeah That was good stuff you gave me, Mr.
Jim Tull: well.
mark carter: And it had a.
Jim Tull: It made me think of set of ontology based on some of the residual stuff at the bottom of those bottles.
mark carter: that's my home brew does it.
mark carter: Make stuff at the bottom of you know, sometimes it's sometimes it's not anyway.
Jim Tull: mark.
mark carter: yeah I do have some blackberries in the freezer for my next for my next batch of a mcfaul black to retire.
Jim Tull: alright.
mark carter: Alright, see y'all.
Jim Tull: Take care.
Mary Beth Lupo: i'll see you in the next group mark.
mark carter: i'm unmuted Syria about.
Mary Beth Lupo: clan I can't find your email that you sent out what are your stops after lunch.
barineau_clinton: we'll jump into the eastern blue Ridge.
barineau_clinton: Okay, so yeah we'll hit the.
Mary Beth Lupo: mark for.
barineau_clinton: Diana and then after we are done with that will go and Mary beth I will afford you that email just seeing how that I should have copied you on it.
Mary Beth Lupo: I I think I have it, I just I can't find it with all the other.
barineau_clinton: Okay okay all right.
barineau_clinton: you're signed up for the trip, so you should have it.
Mary Beth Lupo: yeah yeah all right.
Mary Beth Lupo: i'll probably pop back and forth so.
barineau_clinton: Okay alright.
Ben Davis: And so clint when we get down to the rewards own stuff.
Ben Davis: If we have to, we can just focus on the stuff We found that those outcrops um and you know sort of gain back some time that would be taken away with the PowerPoint.
barineau_clinton: yeah you know i'm going to.
barineau_clinton: So we're we've caught up a little bit basic were two stops behind.
barineau_clinton: And going to do is kind of get through those intubate like stops pretty quick.
barineau_clinton: And then try to try to get into the Dag my phone Pluto on so but i'll do my best to catch us up on time and I know i've got a lot of the next several stops, but I will try to catch us up in the next the end of the next block.
Ben Davis: As much as possible but yeah either way it oh man.
Jim Tull: yeah you guys are assuming this is going to be anybody still on the field trip this afternoon.
barineau_clinton: All right, well i'm gonna pop all so I can actually finish finish some of those things and i'll see you guys in about an hour so.
Ben Davis: All right.
barineau_clinton: Okay, all.
Jim Tull: Right, good luck.
Jim Tull: Presentation done.
Jim Tull: I just tried to join his field trip a few minutes ago and it's it's all recorded so he's just taking questions.
barineau_clinton: yeah yeah yeah I think that's how.
Jim Tull: So it's.
barineau_clinton: I think we're some of the few people that.
barineau_clinton: Live yeah.
Jim Tull: yeah.
Jim Tull: and probably the last time, people will ever be alive.
Jim Tull: So I mentioned, I mentioned to harrell the guy locations in the valley.
Jim Tull: Both at the structural top and a structural base and he said he'd be interested in finding out about that okay so we'll see good.
barineau_clinton: Good that would.
barineau_clinton: Be does.
barineau_clinton: Well then, i'll get you all cued up i'll try to.
barineau_clinton: i'll try to get us caught up a little bit.
Ben Davis: Well yeah I mean either way it doesn't matter.
Ben Davis: that's the you know, the images that are the photos that we took on the lake and elsewhere in the in the jacksons gap.
Ben Davis: You know, rather than getting into the whole jackson's gap issue with the bard zone and the strategically and all that we can just focus on that, if we need to so it's whatever the play calls will do.
barineau_clinton: Okay yeah that's fine, I think, well, I think we'll be able to do what I think I can, I think I can catch us up a little bit.
Ben Davis: yeah I walked outside it's I don't know how it is in Columbus but if it's anything like here yeah it's amazing.
barineau_clinton: No, it would have been a good a good weekend for field trip.
barineau_clinton: least today i'm not sure tomorrow i'm a little chilly with but that's not bad.
yeah.
Jim Tull: yeah I missed the donuts myself.
barineau_clinton: Well, thinking.
barineau_clinton: You know, we should start thinking about this fall about how to get back out on the boat.
yeah.
Ben Davis: I agree yeah.
Jim Tull: yeah well hopefully not as cold, as it was the last time.
Jim Tull: yeah.
barineau_clinton: We see well that's, I guess, the first thing will be it guess it would depend on where i'm at so if i'm still here, then, then of course I have access to our boat, but if not, we can always run a boat.
Ben Davis: yeah.
barineau_clinton: i'm gonna win creek or one of the marinas.
barineau_clinton: And i'm going to work soon as I, since I get caught up on some stuff i'm gonna try to separate.
barineau_clinton: Some work on.
That stuff.
Ben Davis: yeah no that'd be good, I mean that's a step in the right direction yeah and if we can the next time we go out to the lake um you know whether we all go together, you know, Dr tolan I go or I go whatever if we can get a sample of that stuff that we saw.
Ben Davis: Those large zealots inside the.
Ben Davis: are not in seamless but the intrusions that we saw on the lake shore before we actually found that that island.
Jim Tull: yeah.
Ben Davis: There was a whole bank and it was just a.
Jim Tull: button shift.
Ben Davis: The lighting is all.
Jim Tull: yeah.
Ben Davis: If we can get a fresh sample of those we can, maybe, be able to pull off some chemistry okay.
barineau_clinton: yeah i'm still you know pj collect the samples from one of those outcrops i've got somewhere here.
barineau_clinton: So i'll try to process those two and will obviously save some for.
Jim Tull: You you collected some on that boat trip, then you Colin.
barineau_clinton: yeah no that's what i'm talking about was when we.
barineau_clinton: were all together pj was with.
Jim Tull: US those those were decent samples.
Ben Davis: yeah.
barineau_clinton: yeah they're pretty fresh so we got to get something out of them.
barineau_clinton: off to see one thing you know, I think, Paul would be really interested in it so that's a that'd be a good sign.
Jim Tull: yeah.
barineau_clinton: Go ahead and.
barineau_clinton: share my screen here we'll get started here and guess in a couple minutes.
See.
barineau_clinton: should be coming down tallahassee.
barineau_clinton: Sometime before the end of the month.
barineau_clinton: yeah yeah.
Jim Tull: Good.
barineau_clinton: i've got to go in and do some paperwork for for field camp.
Jim Tull: Okay, good.
barineau_clinton: Well i'll try to i'll try to catch all guys i'll try to come down on Friday.
Jim Tull: yeah just let us know.
Ben Davis: Let me know I gotta get you that.
Ben Davis: That stuff back the converter, and the scope okay.
barineau_clinton: That works.
barineau_clinton: Alright, well, I guess it's the witching hour So hopefully I say least michaels back with us we'll see if anybody else is back with us.
Michael Thonis: I see that some of you guys are at Florida state right.
Jim Tull: yeah.
that's.
Michael Thonis: It doesn't hi this doesn't this doesn't mean anything but for me it means something which is my very first georgie course ever took was in high school at Florida State University.
Michael Thonis: I don't know.
Michael Thonis: I don't even want to tell you what year it was in it was in the six that was in the 60s.
Jim Tull: Right.
Michael Thonis: You know, Michael What about you glc inclines my otiose inclines and.
Michael Thonis: It was no onyx.
Jim Tull: Probably Steve winter.
Jim Tull: Back then.
Michael Thonis: can't remember Michael.
Jim Tull: Michael what part of Boston do you live in.
Michael Thonis: I live in I live in wellesley.
Jim Tull: Really.
Michael Thonis: Which is yeah which is out on wellesley college's.
Michael Thonis: On the inner Beltway route 128.
Jim Tull: yeah.
Michael Thonis: it's based on my.
First.
Jim Tull: My first job was with the usgs working on the wells land native quads.
Oh.
Michael Thonis: Well that's.
Michael Thonis: It yeah we came close because I am in college, I went to feel camp and I guess I did well enough that usgs offered me a summer job.
Michael Thonis: mapping in the Boston area yep basically the well as the Boston office of the usgs so that would be.
Michael Thonis: Nice 70 8070 I guess.
Michael Thonis: yeah and and then print President Nixon.
Michael Thonis: killed all the funding for I think it was an nsf those usgs he killed the funding.
Jim Tull: yeah That was a really That was a really good good group of geologists our Boston office you know a lot of more Harvard graduates.
Jim Tull: Exactly exactly.
Michael Thonis: During that time that's a powerhouse there's still a great department, but there's a lot of great departments down Boston Boston college, you know northeastern.
Michael Thonis: MIT.
Jim Tull: they're all hip.
Michael Thonis: wellesley college even they're all terrific.
Jim Tull: Oh yeah.
Michael Thonis: it's not just Harvard anymore, but what we're so where did you live, when you were doing that.
Jim Tull: I lived in I lived in natick.
Jim Tull: Right near the Center of town, I had a kind of a bed and breakfast place that I stayed in yeah.
Jim Tull: yeah and I was working with art Nelson he was the chief geologists mapping that area.
Michael Thonis: Oh i've got.
Michael Thonis: A map.
Michael Thonis: yeah map right in the drawer here yeah sure.
Jim Tull: Okay yeah well, I was part of that mapping.
Michael Thonis: program very good yeah well it's it's interesting now if you go there's a couple there's a couple of Apps, but one that I like is a thing called man coasts.
Michael Thonis: And, and they but they you know they just stitch together all these maps from all over the world, really, but the one that, clearly, you can see where the one they're using for from for wellesley and natick is that one.
Jim Tull: yeah that's great.
Michael Thonis: Well that's cool well nice nice to meet you.
Jim Tull: yeah good to talk to you let's take off okay.
barineau_clinton: All right, well welcome back or everybody that's back with us.
barineau_clinton: So we're gonna we're gonna jump out of the talladega bell and we're going to jump into the eastern blue Ridge, and so we're going to pick up here.
barineau_clinton: Here it stops seven is down here in the southwest corner of our of our region we're going to be down here near Mitchell name.
barineau_clinton: And then look at something to blights here, and then, when I go up to the to the northeastern end and look at some stuff there, so the middle name is here this little and satellite image and if you drop into this region, right here there's a just a spectacular road cut.
barineau_clinton: That goes right through the missile damn uncivilized.
barineau_clinton: And so lots of great exposure here.
barineau_clinton: Unfortunately we were not here on such a nice clear day but uh.
barineau_clinton: so good.
barineau_clinton: spectacular defamation here, you know lots of good information features associated with dynamic thermal metamorphic.
barineau_clinton: mythologies here or just overwhelming Lee ambivalent there are some calc silicate that are also not at this particular outcrop but in another section of it.
barineau_clinton: And so, this is just the whole package is referred to as the Mitchell Bam and the blindness one of those infant lights down in the lower part of the actual supergroup.
barineau_clinton: want to very quickly take us also up to a different outcrop but along strike, and at the same strategy graphic level and so we'll.
barineau_clinton: back out here again to field trip.
barineau_clinton: region.
barineau_clinton: And we'll pick up stop eight and so stop eight is up here at the other end but again it's essentially the same strata graphic level.
barineau_clinton: So this is just outside a little community of halls crossroads.
barineau_clinton: And again, a.
barineau_clinton: A good good road cut through these into light.
barineau_clinton: And so on this good exposures of interval it and as we'll see in a minute some of the local.
barineau_clinton: metal sedimentary rock.
barineau_clinton: So hopefully if you guys are revisit this outcrop you won't have to do it with your headlights like we did but there isn't a dark and again, these are these are good.
barineau_clinton: You know, really thinking like deposits good evidence, for I sequential folding just like we see now in the Mitchell damn again these occupy the same strata graphic level.
barineau_clinton: So they're not continuous mtb like civil rights across the entire state region but they're discontinuous bodies that are mapped and essentially the same strata graphic level.
barineau_clinton: across the entire national gallery mcfaul belt in the in the Georgia and Alabama section and once we get to the GA section.
barineau_clinton: That lower action supergroup is cut out by the younger altoona fall, and so we don't see the same stratigraphy when we jump into GA what's interesting about these is.
barineau_clinton: When you plot when you do geochemistry on these, and these are some alien vs titanium and as they're coming into contini Atrium trace element diagrams.
barineau_clinton: The the kitchen but reiki infinite light, let me saw that last outcrop and the the muscle damage civilized down in the south Western portion of the bell.
barineau_clinton: They plot as mixed mid ocean rich and also within plate basalts, and so we talked a little bit early on, about our interpretations of those uncivilized has potentially being.
barineau_clinton: rift related and associated with the breakout of dementia from Romania, they sit, like any entire action supergroup they sit.
barineau_clinton: In a position where you would expect, if you were going to preserve lunch and slow briars there in the perfect position to be the preserve, for instance, low price.
barineau_clinton: And they certainly had the geochemical character, unlike some of the younger volcanic sand good lights and other rocks we're going to see in some of the the youngest photography.
barineau_clinton: anything we can see it stopped at that gets tricky and verbalize is, we can see in her layered with these into the lights, we can see court sites.
barineau_clinton: And of course we could we could debate or not, whether those are primary minutes and stones are at a church or or courts things but they're.
barineau_clinton: they're good my my keisha slightly felts bath at court sites, and so I would lean toward them.
barineau_clinton: You know, being potentially metal settlements, and I think most people haven't traditionally interpreted them as Meta settlements in are layered with these.
barineau_clinton: These uncivilized, and so it appears that these are you know think sequences of metal assaults i'm sure, in some cases medicines Meta databases.
barineau_clinton: But also interpolated with with constantly derived sediment right and and we know from some of these rocks they have good grumbles work on titles are cons in them so.
barineau_clinton: Alright, any questions on that, before I move on to.
barineau_clinton: Stop nine.
barineau_clinton: All right, well first off first nine we're gonna we're going to add the action supergroup and we're going to move a little higher in the section and go into the overlying would that be group.
barineau_clinton: So we're going to zoom in here in the vicinity of Alexander city and we're gonna have stopped nine here and then later on, stop 10 down here near Alexander city, so it will pop in here to stop nine and take a look at some of that.
barineau_clinton: So this is a big creek which feeds into lake Martin this this particular location.
barineau_clinton: You can see really good exposures, even at this water level in this this aerial image was on march in March and light levels typically are pretty low.
barineau_clinton: From about late November in February and they really start coming back up in March, but this is one of those locations.
barineau_clinton: If we go back and look at some some December imagery you'll notice when the water is very low there's literally just spectacular outcrop you can trace this these beautiful exposures.
barineau_clinton: All along the lake shore and you can walk this shoreline out all the way from the the younger without We grew up all the way into the mcfaul group.
barineau_clinton: And in places is nearly continuous exposure, these are some of the these are some of the best exposures that i've seen in this area hands down.
barineau_clinton: it's hard to beat these on the lake so so we're going to the alcohol he baffling, which is a devonian intrusion it's contact with the with our group.
barineau_clinton: Is is kind of transitional right over this zone and and we, by the time we get right into here we're in pretty much just clear graffiti good graphic variable garnet difference schist that will see in some of these next images so.
barineau_clinton: So the outcrop itself has great exposure on the shoreline, and this is a good image of that outcrop and one of the things will notice here is we get good since the sheer indicators.
barineau_clinton: There they're halfway decent sc fabrics preserved in some of these rocks we also see in some of the Platonic the interest of rocks sick mortally sheared.
barineau_clinton: felt spark bars that have a consistent kind of textural you know top to the right since the sheer, and this is this has given a lot of workers in the region have argued that these are associated with.
barineau_clinton: very wide shares with potential significant displacement and one of the things i'll point out here.
barineau_clinton: That that if you kind of parachuted into any portion of the national medallia mcfall belt and and found you know, especially met appeal is good good shift and especially prophetic schist.
barineau_clinton: You would find these types of fabrics you would find evidence for for simple sheer flattening strain associated with just simple dynamic thermal metamorphic ISM.
barineau_clinton: And so, one of the challenges in working in this area is being able to distinguish you know what what defamation that we're seeing which here that we're seeing is associated with just a regional metamorphic event.
barineau_clinton: And what is associated with younger potential shear zones and so that's going to be a challenge as we, as we talk about this i'm hope i'm going to build to provide some insights into this.
barineau_clinton: Since this year, and these rocks is pretty consistent with the the signal, Professor class we see in some of the times it's kind of a sub horizontal textural sense of sheer.
barineau_clinton: So again, all on the lakeshore from that location, all the way out basically into well into lake Martin is just.
barineau_clinton: You know thick sequences of variable garnet difference prophetic schist inner layered with the occasional solicit futon that will see some of those later on.
barineau_clinton: So questions on the with our group they're.
barineau_clinton: All right, and what we'll do is we're gonna jump out here, so the Dalli Dalli in in Upper contact with the younger.
barineau_clinton: mcfaul group facets roughly right through this region and so we're going to come a little further out to get mcfall and we're going to look at some of the intrusive rocks, and this is stopped in which is at the end of.
barineau_clinton: Kali road at the boat ramp and so.
barineau_clinton: When you add high water when you drop in there.
barineau_clinton: you'll notice you don't see much but, but the STOP we're looking at is actually right here again a high water is is is underwater.
barineau_clinton: And so we're gonna we're gonna see a pretty decent exposure of this large zeno Granite we've got we've got a number of bath with scale up futons out here specifically to alcohol he, which is the largest bath with and southernmost appalachians.
barineau_clinton: The collegian nice it will see you in a little while is also bath what scale futon.
barineau_clinton: The zane have granted releasing a Meta Granite.
barineau_clinton: Is is containing a number of so light bodies of lesser extent than the collage and we'll look at some of the ages and relationships between the two.
barineau_clinton: So we're in this kind of strata graphically are really structurally lowest on lens of those and Granite in this region.
barineau_clinton: So again, this is looking off in the lake where I just showed you, but again at low water, you have wonderful exposure to the Granite here.
barineau_clinton: As you walk out around the shore you just have continual exposures, many of them are not in place, but many of them are in place, as you walk along the bank.
barineau_clinton: The zane itself is a typical It ranges from alcohol sales bar Granite you know into the ground or die rights and so it's a good use case bar muscovite by a tight granted toy.
barineau_clinton: it's got very, very, very bubbly variable mythologies in it that are consistent, for the most part, except for muscular by type contents and they range from really muscovite rich mythologies to vary by a tight race with allergies to everything in between.
barineau_clinton: And so, those are good good exact good typical zane on photos of his hand samples one things we've one of my former students who worked with Paul Miller down University of Florida.
barineau_clinton: For his master's work data designer and the collages will see here in a minute, and this is some we we realized that those dates recently, and we have a manuscript and revision right now we're hoping to get finished up.
barineau_clinton: But if we look at the zane itself that i've highlighted here, in the little red triangles you can see those protons range from about 459 million years.
barineau_clinton: as young as about 433 million years so those those futons a lot of people working in futons like that was simply collect the sample.
barineau_clinton: data, and that would be the age of the futon and what we've realized is, at least for these protons, and these were amalgamated over a relatively long period of time.
barineau_clinton: in excess of 2526 million years in this case and and live a logically they look the same you can't go.
barineau_clinton: Along strike of any of those two times and distinguish between the younger and older ages, based on with allergies so whatever those melts were they were basically melting the same source rock over and over and over again, over a period of about 2025 plus million years.
barineau_clinton: And we, we have good geochemical evidence that those melts are basically there and tactic melts probably of the some of the deeper sedimentary basins.
barineau_clinton: In this region, and so it will also see in a minute that the rocks day intrude were basically deposited roughly in the same timeframe, and so this was a basin that was.
barineau_clinton: had very high deposition rates that was being almost immediately intruded by solicit protons so we'll see more of that here in a minute.
barineau_clinton: So so again, as I point out the design of Granite which is present in the so like bodies.
barineau_clinton: and isolated pods as far as we can tell good exposure is not continuous and so mapping these things as a bit challenging but nonetheless they include the among small group in this region.
barineau_clinton: As well as we do find cena like intrusions even at this that, even at the previous stop so they I think they also can be mapped into the medallia group as well.
barineau_clinton: questions on designer or stopped in.
Beth McClellan: plant is there any spatial arm.
Beth McClellan: Is it all spatially very aged as far as the ages, you get or is there any consistency.
barineau_clinton: The only consistent, so we we see beth is, as you go as you go higher strata graphically and structurally higher in the medallia mcfaul sequence.
barineau_clinton: The ages generally get younger they're not perfect, but there's a general young trend with higher and higher strata graphic level, and I think that what we're seeing is.
barineau_clinton: As sedimentation is progressing we're just seeing those cellulosic Magnus reach higher and higher structural levels of the country rock their intruding.
Thanks.
barineau_clinton: Any other questions.
barineau_clinton: All right, well we're gonna move them now.
barineau_clinton: back out and we're going to go look at the the next strata graphic sequence, and some of the rocks that data some of this little blue tones and treat it so we're going to jump over here, this is where she been.
barineau_clinton: National military Park, this is one of those places where the creek Indians save Andrew jackson's life.
barineau_clinton: And then to reward them he shipped them all off on the trail of tears, so they they probably regretted saving his life during that that battle.
barineau_clinton: But lose zoom in here and look at an outcrop I will caution, if you visit this area, please be aware, you are in a national park.
barineau_clinton: And sampling is is not permitted, or at least frowned upon you have to have permission, so a lot of our samples that we're going to see ages on came from in the river in in many places outside of the park itself so, so this is stop 11 right here on us highway 49.
barineau_clinton: really good exposure of the clouds In fact this was one of the the outcrops that gail Russell did some of the initial uranium webs work on work on on the collider.
barineau_clinton: And so we're here again the clients as a bath with scale intrusion, it is strictly confined to the mcfaul group.
barineau_clinton: It or buts, the braveheart zone and as Ben is going to show us later we found places where we are fairly confident we're looking at the collider.
barineau_clinton: Actually crossing the billboards on interesting some of the jacksons gap, but i'll let him focus on that so so we're gonna look at.
barineau_clinton: An outcrop here in this region that I showed you a horseshoe bend military part the local rock that were intruding here again, like the down in the mcfaul the vast majority of have those units are made up lights so they're they're just a variable variable compositions.
barineau_clinton: But we do have course classics here we do preserve some primary features So these are cross beds preserved in a relatively clean court site in the mcfaul group we preserve coarse grain diet MIC nights.
barineau_clinton: Including granted class like we saw in the late in the late damn formation so whatever it is a month fall basin is it's clearly relatively proximal to.
barineau_clinton: To a continental margin in order to be able to get these these great avoid class and so again, we would argue that this thing is is relatively proximal to the North American margin on the edge of the lunch and plate probably just outboard of the continental hinges on.
barineau_clinton: So this is that exposure there of the collage and I said horseshoe bend on us 49.
barineau_clinton: The collage as a rule, as much coarse grained and indesign of Granite.
barineau_clinton: And, and in fact it has.
barineau_clinton: To Spar class that that in many cases range up to several centimeters and size.
barineau_clinton: One of the characteristics of the of the collage is that a lot of those fields bars had some mortal shapes shapes and so the client is often referred to as the collide job i'll get Nice.
barineau_clinton: And so you can see good Sigma professors class there with a top to the right sense of sheer.
barineau_clinton: We can see that same thing here with a slight top to the right since this year, you get variable census years if you if you spend enough time looking at these things you'll get.
barineau_clinton: You get a little bit of both but but predominantly they seem to have this consistent talk to the right since this year, especially in this outcrop.
barineau_clinton: Like I said in many, many cases those K felts bars are good, you know.
barineau_clinton: My salmon colored.
barineau_clinton: toward the clay's can ranging up through several centimeters and size but but good at good evidence for sharing here.
barineau_clinton: And in fact we we talked about the strain analysis, we did the base of lay down we've also done string analysis on the on the clouds of athletes.
barineau_clinton: And we do see a consistent increase in quantitative strain, as we approach the bard zones, it was clear that declines, it was influenced by the board zone, but the College, of course, is still intact and so it's not disrupted by the board zone.
barineau_clinton: Like like I said on the xena these are our most recent dates on the collider you'll notice the collages systematically seems to be younger then then much of the xena this this oldest part of the collage.
barineau_clinton: Is could be argued, it is least live logically consistent with a coarse grained mega cryptic.
barineau_clinton: grant a toy that we find associated with the same time, so it's possible that that xena but at least our interpretations at this point is is more likely to be collider.
barineau_clinton: But certainly you see that the collage itself ranges from as possible as old as upward vision, but actually into the slurry and just like design and does.
barineau_clinton: So it's clear from this basin that we were receiving solicit Magnus intruding the host mcfaul and without iraq's all the way up into the salary and as young as about 433.
barineau_clinton: So so again is, as I mentioned earlier, to beth as those ages, as a rule in the systematically young.
barineau_clinton: As we move towards the billboard zone, and so the in our interpretation is that we're looking at Magnus reaching higher and higher strata graphic levels in the in its host rock without you know mcfaul group.
barineau_clinton: Any questions on that.
Jim Tull: When you said you said top to the left that you mean.
Jim Tull: He said talk to you mean talk to the left.
barineau_clinton: What I said.
Jim Tull: Okay that's all right.
Jim Tull: The other thing is, do you expect people to believe that you did not sample in the National Park.
barineau_clinton: You know I do my best not sample in national park it's like those things where I guess if you don't pass the highway patrol you're probably not really speeding.
Jim Tull: Well don't forget you got mark Carter on here so yes he's a piece one of those dark steakhouse yeah or deep sleep yes.
mark carter: Exactly.
mark carter: Thank you for pointing that out and.
mark carter: Do I represent.
barineau_clinton: yeah what I will tell you is none, none of the ages, that you saw were sampled from horseshoe been and now national military park or any other national park for that matter, so.
barineau_clinton: i'm just gonna leave it right there.
TOM HANLEY: Let me ask you a question.
barineau_clinton: yeah go ahead.
TOM HANLEY: It looked on the map look like the zeta might be cutting across the College is that is that just.
barineau_clinton: yeah, so there are places Tom where you can you can find collider and xena looking with allergies in the same outcrop right so you'll go you'll be in the host some of the shifts in the mcfaul group.
barineau_clinton: And you'll you'll be systematically trying to sample it and you'll you'll find a rock that's clearly you know, an igneous rock and you go okay this looks a lot of xena.
barineau_clinton: And you walk you know 1015 feet away, and you can find all the theology that looks like the collider and so it's clear they probably were co mingling with one another and the date suggest that the date suggest some commingling.
barineau_clinton: yeah yeah and so yeah when we when we created this map, and of course exposure here's limited great on the lake but, of course, Tom you know what it's like to work here in Georgia Alabama on this rocks and so, but.
barineau_clinton: But as best our interpretation here was it looks like that we're seeing potentially a contact between those two futons in that.
barineau_clinton: area but there's certainly other other interpretations could be made.
barineau_clinton: Nice yeah absolutely any other questions.
barineau_clinton: The other thing i'll point out that I forgot to mention is the little the little diamond shape there, that is a metal volcanic unit that we we sampled out of the medallia our initial thoughts on it we're that might be a paradise by type paradise, I met a grey wacky.
barineau_clinton: After processing and dating it the Zurich on population and some of the other characteristics were more consistent with it being volcanic an origin.
barineau_clinton: That has about a 454 age on it, and so what that suggests is that the deposition of age of the medallia you can be constrained.
barineau_clinton: To middle or division turns out, we already knew that because we had ordovician the titles are cons in the valley.
barineau_clinton: And so we're going to see at the end of this that that when you when you kind of tie all that data together.
barineau_clinton: it's pretty clear that the medallia mcfaul were being deposited essentially the same base, and that was receiving constantly derived detritus plus plus volcanic material and then the almost immediately interested by solicit muscles Magnus.
barineau_clinton: Any other questions on stop 11.
barineau_clinton: Alright well i'm gonna.
barineau_clinton: i'm going to jump back out here to our full region.
barineau_clinton: So those were roughly in the middle of the region, so now we're gonna do is we're going to zoom in here to the east side right across the Alabama Georgia state line, so this is near the town of brookville.
barineau_clinton: tween carrollton Franklin.
barineau_clinton: And this is a stop from we've done a couple of different field trips, and so I won't not going to spend a lot of time on it, but this is a great.
barineau_clinton: And fibula exposure here on the highway between route bill and Graham Alabama.
barineau_clinton: So there's great delight exposures throughout this area there's even a what appears to be a solicit because at them.
barineau_clinton: die cutting up through this or potentially a solicit medical clinic that we're we're trying to date but there's good if you can clear the weeds out there's good exposures and fill out all the way through that outcrop.
barineau_clinton: And then into like is in the lower part of the the mcfaul group and Alabama we refer to that as a josie leg formation and so there's a thick body men civilized is not the only info boy outcrop in this region, but then there's a big bodied men typical light that looks appears to be.
barineau_clinton: Roughly parallel to primary layering in the in the mcfaul just like formation, among others, metal P lights and Meta Gray wacky which give you some kind of compositional layering in that.
barineau_clinton: It turns out, these are not the only interval is that the wood alley in a mcfaul groups, along with action supergroup are just riddled with them civil rights in Alabama end in Georgia.
barineau_clinton: And, and so we one of our colleagues crystal to noma at the US geological survey in Denver worked with us years ago in in early we started to compile a lot of the published information, as well as our work.
barineau_clinton: And he started did a lot of trace element geochemistry on it, and so what i'll point out here is that we.
barineau_clinton: The infrared lights and the mcfaul group and the daily group and in a minute we're going to bring in rock from Georgia, the new GA group as as well as rocks of the dawn of the gold belt.
barineau_clinton: That are the pumpkin pumpkin creek formation and some of the more.
barineau_clinton: classic metal Catholics Meta settlements in the lot of gold belt and plot of others up and what we see and I showed you one of the earlier plots that showed the actual supergroup rocks as plotting in that kind of mixed more.
barineau_clinton: And within plate basalts but rocks of those middle volcanic rocks of the month fall with down we and Belinda gold belt.
barineau_clinton: They consistently plot in a mixed mid ocean rich back our base and field into the Ark field, and so they they have all the hallmarks of a super subduction system.
barineau_clinton: And that mixed kind of more artfully aight signature is very typical backyard basins, we see on this.
barineau_clinton: Atrium lithium Ion plot a lot of them plot in this central field here, which is often associated with the backyard basis, but certainly you get a lot of signatures out of this, along with those mid ocean rich signatures.
barineau_clinton: And so i'm going to try to put all this together, as we kind of wrap up our discussion of the of the eastern blue Ridge, and then we'll jump across in or into the zone and i'll turn this over to Ben so but to try to synthesize everything we've talked about so far.
barineau_clinton: This is just a regional geologic map hopefully you recognize it from some of the previous slides and so outline two regions, we discussed in detail in one is this ashen medallia mcfall belt.
barineau_clinton: which comes up here and kind of terminates right in this region and it's separated across a fall from the logic of gold belt.
barineau_clinton: But a lot of a gold belt has rocks are pretty much the exact same age exact same chemistry and the occupy basically the same structural position that rocks of the Dalai Lama go gold bill do.
barineau_clinton: If we couple that with the he'll be greenstone here at the structural top of the talladega bell and we recognize the also has same age same geochemical character.
barineau_clinton: Then we can start trying to look at the bigger picture here, and I think we've we've published this in several places, but we interpret.
barineau_clinton: These rocks as belonging to what we refer to as the with dally a mcfaul Delano go back art basin.
barineau_clinton: And what's what's interesting is the hill be especially ties rocks of that back art basin to the lunch and margin, because we know from the relationships.
barineau_clinton: Between the syllabi in the underlying photography and Jim discuss that the the idea that, for the most part of the the entire strike front of the hill Ob.
barineau_clinton: You really hard pressed to find places where the syllabi is not relatively parallel to strategically in the underlying football but talladega group there are a couple places where there might be a hint of some geographic cut offs but they're very rare.
barineau_clinton: And so, whatever the hill will be wherever the he'll be came from it could not have come from very far because, if it had been.
barineau_clinton: thrust a significant distance, especially over any significant rounds.
barineau_clinton: In the Hillary thrust in he'll be thrust, we would expect to Hillary to be significantly deformed before it arrived on top of the talladega group intervention shelf.
barineau_clinton: And so, because you can roughly tie the hillbilly to being relatively close to the orange and shelf and the hillbilly seems to be genetically related.
barineau_clinton: To rock so that medallia the rest of the month, without we won't fall belt, as well as a lot of gold belt.
barineau_clinton: That our interpretation, as these rocks probably performing relatively close to North America, so when you put all this together from all these stops we discussed so far.
barineau_clinton: We haven't ordovician to salary, instead of military base and out here mark by the medallia and the mcfaul groups, and they have good or division two titles are cons in them.
barineau_clinton: We know that rocks of the Hillary as well as some local metal volcanic rocks in the medallia mcfaul groups, as well as the long ago belt of good or division to potentially as young as Hillary and Obama volcanism.
barineau_clinton: We know for a fact now that the solicit clintonism we see in the without you know mcfaul belts not only design and collider.
barineau_clinton: But also protons all the way up into into the eastern blue ridge of Georgia range from audition to sillerman.
barineau_clinton: We know that the trace element geochemistry of those may think rocks is very consistent.
barineau_clinton: with him forming in the backcourt base, and we also know from half the M and N need any homework that the the felts that components of those by modal rocks.
barineau_clinton: were being influenced by grenville crust we know the basin's were receiving to try us from a proximal continent that included grumble basement, and so what you're left with is this interpretation of well this looks like it represents in Division two Sumerian pitches backcourt basin.
barineau_clinton: That formed relatively proximal to the north of ancient North American margin, and so this is a just a kind of cartoonist construction.
barineau_clinton: Of of what that, based on my might have looked like and as as ben's going to add to this is our most most recent information most recent work on the date bill complex.
barineau_clinton: Now allows us to tie an art to this, so it turns out, this is, we have a really good analogy for this today, and that is the the see Japan or the EC between Japan and the Asian mainland.
barineau_clinton: And I think that we can reasonably argue that we can place our strategic fee within this kind of structural framework of a sea of Japan style basin.
barineau_clinton: And so the reason, this is important is unlike in the northern appalachians where the conquer rajini is marked by by collision or genesis by some regional metamorphic.
barineau_clinton: Clear and abet abduction of Arc terrains or a parallel dimension terrains on to the North American Shelton slope we don't see that in the southern most appalachians.
barineau_clinton: This this whole region stays its course active during the conoco rodney as an accretionary origin curriculum overriding plate.
barineau_clinton: But we don't see evidence for a good collision rajini down here as been noted.
barineau_clinton: That suggests that that the the two ends of the origin from the northern, southern appalachian must have some sort of tectonic discontinuity up potentially a large transform fault somewhere between the two ends that accommodate a polarity flip during the economy progeny.
barineau_clinton: So with that i'm happy to answer questions.
barineau_clinton: on any of the outcrops we've seen in the eastern blue Ridge.
Michael Thonis: Just to pick up on your Japan analogy, because I, you know I think that's sounds that sounds great.
Michael Thonis: Why, in Japan, were to decide to.
Michael Thonis: Make it sound like it's a being but if Japan were to collide required or collide with with the mainland it wouldn't necessarily have to do it evenly from north to south know, and so you could imagine, for example, that the connick that the yeah that to conduct carolinian.
Michael Thonis: super Arc if there's any such thing if there was such a thing by to have collided more severely on the Northern side.
Michael Thonis: But we today call the mechanics and not really have collided as severely at the southern side, maybe even not at all just state as an open basin yeah that would necessarily and that was it still we still be a credible on strike continuity, but not in terms of the tectonics yeah.
barineau_clinton: I think what's really important there and so that's an excellent point is is the you do not have to have an art collision I think it's very clear.
barineau_clinton: You know, work in the talladega belt, especially shows that during throughout the conoco rajini.
barineau_clinton: The the talladega group the youngest photography there didn't arm, excuse me, the the the the silica marble and the the automation rock did not seem to have noticed, there was the conoco rajini going on, so.
barineau_clinton: So whatever whatever was going on and southern appalachians we interpret those as being the most distal the distal Angela mentioned shelf and they were largely unaffected, at most, they experienced some slight kind of morphing of the margin at best.
barineau_clinton: And so, so, then the question becomes Okay, we don't have to necessarily close that base, and you can leave those arcs outboard.
barineau_clinton: But what plate were they on right, and so one of the big things that that we see that's really different from the northern, southern appalachians is.
barineau_clinton: And in your into the world those to conduct Arc terrains those accreted terrains they're separated from the lynching rocks by accretionary prison.
barineau_clinton: And so I can think of things like the the real holly belt or the red Indian lineup and the Canadian maritimes we don't have the same thing down.
barineau_clinton: Here we're lacking that accretionary prison that would suggest that the Ark was sitting on the opposite plate, and so in On top of that you'll also notice with I go back to this other image you'll notice that the the arrangement of those coupons rights.
barineau_clinton: As even arrangement these belt right in your region, the world it goes, you know continent shelf, you know shelf slope rise and then Arc in your backyard terrains are, on the other side of the art in our case.
barineau_clinton: Our backyard rocks are sitting on what we interpret as the slope rise in North America or directly on the shelf.
barineau_clinton: In some of these cases, so the geometries flipped and so, but the only way that we've been able to reconcile, that is, you really have to flip the polarity of the subduction zone.
barineau_clinton: And if.
barineau_clinton: We look at the timing between the two ends of the belt, it looks like that roughly our our to conquer rajan he was was going on about the same time that it was in England and then Canadian maritimes which suggest you know, there you have to have a polarity flip.
Michael Thonis: Yes, which, which would be hard to do without a transform fault.
barineau_clinton: that's right yeah yeah yeah.
barineau_clinton: So we think of this almost like a new.
barineau_clinton: Zealand style.
barineau_clinton: Alpine fault.
barineau_clinton: accommodating a polarity flip across to subduction zone yeah obviously you know that model may change through time as new information to discover, you know as we learn more more about it but that's probably the most reasonable model we can think of, at this point in time.
Michael Thonis: Is there any other hint of a transform fault, you know talk graphically or otherwise make.
barineau_clinton: Good yeah the challenge would be obviously that that whatever that transform fault was first of all, we don't have good control over where where it is right, is it.
barineau_clinton: Is it all the way down the soda appalachians do you put it.
barineau_clinton: Somewhere South in Virginia, do you put it up in New York at the you know New York promontory it could be anywhere in there, but on top of course the The biggest problem is that terminal allegheny and rajini would have really messed up.
Michael Thonis: smeared out.
barineau_clinton: yeah absolutely, so I think you know I can think of some some potential ways of trying to tease that out, but I don't know at this point that we have a very satisfactory answer as to where that that transformed boundary might exist.
barineau_clinton: It Jim you're muted.
Jim Tull: um that's probably a good thing, first of all, when you're talking someone from Boston you don't say y'all portion of the world.
Michael Thonis: I would be.
Jim Tull: One of the things that we don't see in the southern appalachians is any any real evidence for ordovician defamation in the for land there's a their plastic wedge there the blending and classic wage.
Jim Tull: You know, we don't have ordovician through us we don't have a lock bonds that arrived in the base and like you doing that the conical icons.
Jim Tull: In New England.
Jim Tull: is like I said earlier, it looks like the first evidence of Congressional defamation that we see is actually in the Mississippi and when the hill be thrust arrived.
Jim Tull: But if you look at the unconformity is above the middle or division sequences in the foreign land, there is absolutely no evidence that there was defamation, other than vertical uplift.
Jim Tull: In the foreign land there aren't any there, we can see any evidence of water fish defamation and then we can argue for quite a while about where there's actually any ordovician throw us.
Jim Tull: In the blue Ridge or somewhere like that those are also in question, so that the economy garage if there was such a thing in the southern appalachians.
Jim Tull: did not seem to affect the for land or the or the continent.
Jim Tull: During that period of time, there were you know those you could have accreted terrains outboard of the margin, but to move them across that margin and up the.
Jim Tull: The hinge across the Angela and doesn't seem like that occur anywhere.
Michael Thonis: Now the same with the allegheny but in the opposite way right.
Jim Tull: yeah.
Michael Thonis: Exactly southern appalachians but not much of New England little bit, but not much.
barineau_clinton: I think it's important to recognize we we tend to I think our minds as a whole, when we think of a rajneesh we tend to go with these collisions style origins.
barineau_clinton: and looking at origins, like the laughlin and southeastern Asia, I mean South South Australia, which is had literally thousands of kilometers of accretionary or genesis on the overriding plate without any sort of terminal collision those need to be the models that we start thinking about.
barineau_clinton: It turns out they're really good they're very analogous to what we're seeing here, if you could somehow you know jam jam Australia up against another continent on that southeastern margin and really telescope the whole thing.
barineau_clinton: You might see similar geometries here, but you know I think the laughlin provides kind of an intermediate.
barineau_clinton: You know if we were to carry the the see Japan model out a little further and have it happen over and over and over again, I think we might see a laughlin style origin there and then of course we just need to collapse it.
barineau_clinton: In a collision origin and to give us what we see in the appalachians but the great thing about the the laughlin and other origins as extension all accretionary origins.
barineau_clinton: Is they can account for a lot of this disparate in different data we sit down here, these arguments over was there at the conoco rajini I think I think we've gotten I think our brains have gotten stuck on that collision origin.
barineau_clinton: Any other questions.
barineau_clinton: i'm going to turn it over to you been I think we've got I think we probably get through at least one star, if not we'll see how fast you go.
barineau_clinton: Before we take our last break of the session, which will take about 15 minutes, so let me Let me set you up so we're now going to.
barineau_clinton: zoom in here into the vicinity of jackson's gap so in the region, the reward zone and we've got a few stops that will see.
barineau_clinton: In this area, 13 A, B and C and so.
barineau_clinton: 13 a.
barineau_clinton: he's right here all blackwelder road unfortunately do not have a street view but i'll let there's not much to see they're just a lot of dirt so.
barineau_clinton: i'm going to turn it over to them.
All right.
Ben Davis: Well we've you can go ahead and do the next one, there we go alright so we've been talking about all district ticket fee, as we move closer to the the southeast as we approach the provide zone.
Ben Davis: We have good controls on you know the talladega belt, the action would alley among fall, we have good controls and understanding of how everything's working there.
Ben Davis: One thing that is still up in the air is the bravado what, how do we explain it, how do we explain the jacksons gap group um you know there's shearing.
Ben Davis: But there's no way to describe offset so that's what kind of what we're going to talk about today on this slide right here, you can see.
Ben Davis: The regard zone and the jacksons gap group coming out of Atlanta towards Alabama and it goes towards jackson's gap, but it stays linear.
Ben Davis: Roughly holds the same strike the entire way until jackson's gap, and then it starts to take a turn to the south.
Ben Davis: Now that's a straight line if you flip to the other side of the database complex when you're looking at the the stonewall line the southern bounding fault it's folded.
Ben Davis: And looks completely nothing like the the katie couric fault or the banner fall So how do we reconcile this and so that's kind of what we're going to talk about next slide.
Ben Davis: Okay, so liberal arts zone is kinematic Lee complex subject, as all of you know it's been debated about for years and years and years.
Ben Davis: I believe it was Arthur king in 1905 first described a graffiti schist near the town of North Carolina.
Ben Davis: And you're in Alabama bentley another in 1970 they described the reward zone as a zone of defamation and cat cases bound to the north, by the band default into the south by the katie couric fault and the katie couric fault sit structurally above the band default.
Ben Davis: More recently the bard zone has been interpreted as a composite structure or a poly phase shift zone separating the eastern blue Ridge stratigraphy like the month on the same enclosure Granite.
Ben Davis: From the inner Piedmont.
Ben Davis: The jacksons gap group and blue has those yellow things or court sites, the blue is represents a grid of fictious the lights button, she has all sorts of stuff.
Ben Davis: it's approximately two kilometers thick and it consists of a sequence of coaxial compositionally layered package of rocks bound to the north, by the band of fallen to the south, by the sentiment of morphic katie couric fall.
Ben Davis: And the katie couric fault like I said it acts as the roof thrust, whereas the band default is the floor thrust of the bernards on next slide.
Ben Davis: So over more than 50 years of previous research.
Ben Davis: And kind of helped shape the way we view the provide falls down um so there's been a lot of work, especially from a lot of Doc the auburn students they've been mapping quadrangles and it's actually help shed light on some of the issues that we're facing in the Bernard so next slide.
Ben Davis: Okay, so this is an area.
Ben Davis: Of the band default in the front lawn your quad and clint do we have this Polygon on the Google Earth.
barineau_clinton: um let's see, I think that ado let's check it out.
barineau_clinton: yep let me zoom in here.
barineau_clinton: So there is the band default, yes, there is the katie couric fault.
Ben Davis: So this, you can see it, I mean it's clear as day from a satellite image, but basically when they ban a fault right there, you can see that there's a bit of a false start.
Jim Tull: going from the.
Jim Tull: The band default is, on the other side of that field to the southeast so that white line needs to move not that one the other one.
Ben Davis: yeah and it's nice yeah.
barineau_clinton: I I do reference one yells quads and so as possible the the puzzle the projection was off by a little bit.
Jim Tull: Okay that's fine but anyway that's has been said that's an escarpment.
Michael Thonis: yeah so it's on the it's on the lower end of that White Okay, there are some that.
Ben Davis: You can set right up to the the the Ridge there, which is run by a court site unit, known as the backbone quarter yeah.
Ben Davis: it's it's it's pretty amazing to see and it's it's kind of hard to miss.
Ben Davis: Can we go back to the PowerPoint yep absolutely.
Ben Davis: Alright, so again, this is the view you're standing in the eastern blue Ridge, and the hillside in front of you, that is, at the base of that is where the band default is and so next slide.
Ben Davis: And so again so that's what it looks like this is all within the colonia seven and a half minute quad in Georgia and where the street view was is where that story's next slide.
Ben Davis: Okay, so if we look at the katie couric fall we're actually able to find it outcrop where the katie couric was almost right up against the.
Ben Davis: ropes creek and fill out of the database complex, so what you're seeing here, these are images that they're outcrops of button schist located along the katie creek.
Ben Davis: In the felonious quad the sc fabric and the button just suggest that the furthest along the katie couric fault was obliquely right lateral the outcrop was nearly in contact with the ropes creek and felt like it was just a.
Ben Davis: few hundred feet down the road in this timberland that was clear cut it's actually amazing that we actually got to see it.
Ben Davis: yeah crop of the button schist.
Ben Davis: is about five to six feet long it's about three feet and width that these samples came from.
Ben Davis: And it's highly solidified.
Ben Davis: Consistent Horn blaine chloride courts mica and accessory garnet you can see sort of where the sc fabric is it's sort of top to the right next slide.
Ben Davis: So, if we look these photos were taken from I believe stop 13 a on the Google earth file, but these are just south of jackson's gap Alabama.
Ben Davis: You can see compositional layering common rock times found throughout the the jacksons gap group, our Court hornblower by type schist carnatic first prophetic shes.
Ben Davis: Massive my cases court sites that we're going to talk about here in a little bit Meta grey wacky is not a conglomerates thin layered and fibula it's fine grain Nice, such as the yellow dirt.
Ben Davis: And we're going to talk about some new potential nicest that we found.
Ben Davis: Along the lake.
Ben Davis: lake Martin.
Ben Davis: next one.
Ben Davis: Okay, so i'm just real quick Higgins at all in 1998 or 1988 they show basically the jacksons got group stratigraphy coming out of Georgia.
Ben Davis: and basically acting as a shadow graphic unit, as it comes down to the coastal plain next slide.
Ben Davis: If we look at the work by Crawford and Madeline and 74 these these little.
Ben Davis: map incidents are on a traverse from Atlanta moving south west towards the Alabama line, and you can trace court sites and as well as you know, other shifts and phil lights, all the way down through, and so, if you're you know you're talking about a pervasively sheared boulevard zone.
Ben Davis: there's evidence, I mean the units there strata graphically in line with each other they're not everything's Nice and neat and so, if there is.
Ben Davis: You know, a high degree of shearing in the broad zone, this brings up the question that we you know we were talking about earlier how like, how do we quantify that can you put a number on displacement and that's kind of the issue that we're facing now next slide.
Ben Davis: Okay, so this is from the for longer seven happened at quad.
Ben Davis: You can see continuous coaxial strategy or sugar free with no pervasive shearing the long island creek Nice or the yellow dirt nice it's a continuous.
Ben Davis: sort of body attacks almost like a seal on and it comes, all the way out of I believe the farthest extent of it is up in towards Atlanta, and it comes, all the way down.
Next left.
Ben Davis: Okay, so I believe this is from Riley hard said and Dane vendor boot in be and then a caption for my at all 2019 but, basically, you can see that on in either map.
Ben Davis: There is not a lot of data along the actual fault zones themselves So how do we, how do we classify them as share zones or strike slip faults.
Ben Davis: We need more data, what are we basing this data off of.
Ben Davis: You can see in both maps that the share your fee is nice and neat it's coordinate coaxial doesn't really suggest significant shearing.
Ben Davis: Next slide.
Ben Davis: All right, so what is the preferred faults on them is the default zone or is the default block, how do the abandoned katie couric faults into this and what does this mean for the jacksons gap group in the eastern blue Ridge, so we go to the next slide.
Ben Davis: Coming out of Atlanta, you can trace court sites, all the way down through the jacksons gap group, including the.
Ben Davis: chattahoochee palisades all the way down to the backbone you get closer to jackson's gap becomes the devil's backbone.
Ben Davis: Then the classy court site and the hinge of where the till I see some form, is it wraps around into photography of the open like a group in the loop polka formation, as the saga hace court site and then goes back up towards Atlanta.
Ben Davis: acting as the the poor mountain and all that, so we have continuous.
Ben Davis: Court sites that we can map all the way around the database complex and the jacksons gap group and in the open, like a group.
Ben Davis: And if you go some of these outcrops and especially where you're saying these there's pervasive shearing none of the the Court sites are.
Ben Davis: Displaced they're Nice and either altogether and they formed long linear ridges so it's kind of hard to reconcile that and so that's this is some of the issues that have sort of been brought to light that we need to address as a scientific community so next slide.
Ben Davis: All right, so this is from grimes that all 93 what you're seeing in the the red circles there it's where micro brechtian dykes are sort of splitting off the advantage for going towards.
Ben Davis: Alexander city Alabama.
Ben Davis: south of there.
Ben Davis: we're trying to figure that out so along the lake, which is what we're going to come up with is is there the default is actually continue into the lake or does it die out there.
Ben Davis: What happens with the katie couric fall does it come down or is that a stone will align coming up and being cut by the creative grateful So these are some issues that we need to address next.
Jim Tull: Then, then, can you show us where jackson's gap is on that map.
Yet.
Ben Davis: Right about where say if you come up right there right in there it's about where jackson's gap is.
Ben Davis: And I believe correct me from wrong but there's a few quarries where they were they were using some of those microfracture dykes as a as road material.
Ben Davis: yeah okay next slide.
Ben Davis: Okay, so this is from will Chomsky 1983 he also shows the microbe extra dogs coming off the band default and, if you look inside of his regards on within the the width of the the arrow there's numerous faults that are running through there.
Ben Davis: And so it just adds to the you know the argument there's multiple interpretations of what's taking place in the dark zone, if you see sharing some people want to put faults in there is it necessary, if there's not any any displacement, so this is just another example.
Ben Davis: Next slide.
Ben Davis: So the map on the left is from abraham's 2014 he mapped the davao quad in.
Ben Davis: From auburn map on the rice Vander blue and red reward in Stoughton poll.
Ben Davis: And then the map on the bottoms from pool 2015 there's multiple interpretations and you can see, in abraham's map he has the microfracture dykes coming off in the the yellow but he also keeps the band default running through the lake as a strike slip fall on with.
Ben Davis: Not a lot of data to support that, and so this is an area that we're going to actually investigate at the tip of that his strike slip fall arrow.
Ben Davis: there's a little island in red and we actually were able to go visit that it low pool level in Lake Martin and so it's given us kind of a new new.
Ben Davis: rationale so we're going to talk about here in a second.
Ben Davis: Next slide.
Ben Davis: Right, so this is the our town quad by Hawkins 2013 and.
Ben Davis: put right next to the devil quad the rams did, and you can see the fault for the majority of the time in these maps it runs down the middle of the lake and so there's not really any data for the band default, so it begs the question does it actually exist there next slide.
Ben Davis: And so that island that we were talking about is in that the black circle on the right, but it's this is exactly where the band default should be coming down through.
Ben Davis: We went there and we found something else that suggests, it could be an intrusive relationship with.
Jim Tull: Ben could you tell us what the colors represent on that map.
Ben Davis: Oh Hello on the map on the left the red is the culture Nice on the yellow sort of streaming thing that's the one of those Mike microfracture dykes, as you cross the the the fault, there are the suspected fault.
Ben Davis: you're in strategic view of the jacksons gap group button schist fill light court sites, the Court site and yellow right there.
Ben Davis: And then you work your way through over to the katie creek fault you crossing into.
Ben Davis: Strategic fee of the database complex and so right there I believe he interpreted that to be the words will shift, which is actually just the upper most member of the rugs creeping fibula and then the orange is more than likely the chatter socket creek Nice.
Ben Davis: And that might be an alternative unit.
Ben Davis: Next slide.
Ben Davis: So, if we look at our crops from the lake that were able to get to by boat, you can see that there's.
Ben Davis: A by tight organize there's their skills inside these buttons just and these fill lights on and on the island, that I was talking about earlier we actually found courtside and then on either side of it was nice and so we're interpreting that to be calendula Nice and next slide.
Ben Davis: So if you have the yellow dirt or the the long island preet Nice in the jacksons got group theoretically why can't you have more than one intrusive unit into the jacksons gap group.
Ben Davis: And so here's some you can see the full scale these, this is a Jon boat that we took a photo from so there's not really a better scale.
Ben Davis: But you can see just how expensive these things are they actually run you know a great portion of the lakeshore their.
Ben Davis: Next slide.
Ben Davis: And so, this is probably the best outcrop that we came across which you definitely would not be able to find unless the lake was down.
Ben Davis: But we interpret this to be a collage and ice and if you can see the intrusive contact there with the the Court site of the jacksons gap group.
Ben Davis: So, if this is an intrusive relationship, then we have to get rid of the default and So what does that mean for the band default, we probably has to tip out somewhere in jackson's gap where the the strategic returns to the south.
Ben Davis: And so, this is kind of a new line of or a new realm of work that needs to be done and that we've just actually started so.
Ben Davis: Next slide.
Ben Davis: here's some there was an A an outcrop just north of where that those lakeshore photos were taken this long land.
think it was 13.
Ben Davis: yeah This is our our most recent find.
Ben Davis: There we go, this is actually an old old pit that they were pulling material out of there's another one off in the trees that isn't labeled but.
Ben Davis: In these in these photos you can see a button chest and there's flight.
Ben Davis: Right lateral sense of sheer and within it is nice, so we dug it out, we got a good sample out of it and it's a by tight organize we're hoping to get zircons out of it soon.
Ben Davis: to compare to the cloud denies but we're also going to do, chemistry on some of the other samples that we collected from the lake and see if we can sort of reconcile this whole fault dilemma and jackson's gap conundrum.
Ben Davis: And yeah.
Ben Davis: I hope I wasn't flying through that but uh any questions.
barineau_clinton: sure where that lakeside outcrop is.
barineau_clinton: In these are these are pretty much only accessible by boat so low water and boat is about the only way to see these things.
barineau_clinton: Well, there are no questions you know I think we're I think we're a little past our our break, so we want to want to take a 10 minute break.
Ben Davis: yeah let's do it yeah.
barineau_clinton: we're we're what we're here for scheduled break so we're gonna take 10 minutes and and then that'll be the after that we'll come back that'll be the last hour so we'll reconvene at 345 Eastern time to 45 central time all right.
Mary Lupo: hey clint there looks like there's a question that just popped up.
barineau_clinton: yeah I was just going to respond to it so yeah, the question is how do we know that the courtside isn't true to collide yeah Of course I wasn't deposit on top of it because it's courtside on both sides, and so you go through these alternating sequences of court site and and again.
barineau_clinton: intrusive rocks excuse me.
barineau_clinton: That look a lot, like the collage so they look like classic intrusive relationships into the Court site and not deposition or relationships.
barineau_clinton: To have any debt positional you basically have to deposit it intruded rewrote it back down to it, deposit more courts, and you know bury it wrote it and so yeah, so I would say that would be that'd be a tough trick to pull off.
Josh Poole: You pause that for me.
barineau_clinton: what's up.
barineau_clinton: Somebody have a question I think I missed it.
mark carter: Like follow up with Ben is still on he may have stepped out yeah.
Ben Davis: Like that great.
mark carter: Oh, there you are yeah and I can argue with that with that one photograph that to show that look like it was pretty good in fruits of relationship.
mark carter: between those two units, but a lot of your other outcrops they all looked up cheered me they all look like they were mala tonight.
mark carter: And could you have blocks of your color nice just kind of shared up with all these other things in a in a broader shares so you're just kind of partitioning.
mark carter: The sheer between the more fatalistic units and retaining some larger chunks and blocks of football and hanging wall rocks all in the same cheers and.
barineau_clinton: I think the challenge the other mark is in, I agree with you, you could make the interpretation.
barineau_clinton: That pieces of the collage i've been ripped off into the you know the broader Reversion as, as you know, in horses, or something like derived from the football.
barineau_clinton: The problem is a lot of those court sites in regards on they preserve primary structures.
barineau_clinton: And so, if you have preservation of primary structures in the Court sites it's hard to argue that they were being you know extensively modernized so that means you're forced to put you're forced to kind of partition all the strain.
barineau_clinton: Out of the Court sites out of the nice's and into some other mythologies yep.
understood.
mark carter: The geology was easy would have been done long ago right.
barineau_clinton: yeah that's right yeah the other The other thing I think it's important to point out here is.
barineau_clinton: And again right now we're correlating those intrusions with the clients because they're dead ringers for the client and they may or may not turn out to be, because we all know that you have to be careful with appearances, but if they do turn out to be in fact collides.
barineau_clinton: Across all in the board zone in in intruding on the jacksons gap, then, then that put some real constraints on potential movement across rewards on because now we have good ages on the collage.
barineau_clinton: You know, basically, the closet would would basically pin that fault as being you know head, it would have to be you know solution or older, in order to do that really ordovician older because portions of the clouds rights back that age so right right yeah.
Jim Tull: And it's the latest thing in the kinematics tickets to the Banda has to be yeah.
Mary Lupo: I think, for those of us who don't work expressly in the inner pima it would be helpful to show a geologic map as you guys are talking about this.
Mary Lupo: Instead of this beautiful Google earth image.
barineau_clinton: Then what map should I show.
Ben Davis: um let's see can go to yeah.
Ben Davis: Go to slack you can go forward, if you want.
barineau_clinton: For okay i'll go for them.
I gotta.
barineau_clinton: say when.
barineau_clinton: Rather, but this one okay.
Ben Davis: Well, I can remember.
yeah.
Mary Lupo: I mean, then, like as you guys are talking about some of these relationships we can come on it's in front of us.
barineau_clinton: will come back at the end so again we'll reconvene here in a couple minutes and then we'll then we'll we'll.
barineau_clinton: finish the Piedmont discussion and then we'll make sure there's plenty of time at the end for for us to revisit all these things I know there's plenty of people out there that have that work in the same areas that probably have lots of questions.
barineau_clinton: Since we can't be on the outcrop together to Hashem out, we can hash them out in zoom and solve all the problems of the world.
mark carter: I am impressed with you all as outcrops down there and let's be sure.
barineau_clinton: These are the best ones that.
barineau_clinton: You have to look a long time to find these guys.
mark carter: yeah know i've always.
barineau_clinton: say this, the lake Martin is impressive I mean just hands down you can't in the in the in Alabama i've never seen anything outside of a corey this impressive as the outcrops on like morton at low water levels.
mark carter: I agree yeah these big lakes do or do a great job, particularly if they fluctuating water if they have a just keep washing off those banks man and sometimes you're getting.
mark carter: 90% exposure.
mark carter: And that's really good looking stuff yeah.
mark carter: It is a southern appalachian geologist always have a.
mark carter: problem when people say oh you don't have any outcrops down there.
mark carter: And don't have any our products in the.
mark carter: Piedmont you don't have any outcrops in the coastal plain it's like no you just you know you got to work for them a little harder, but you know what is what's floating around and kayak or Jon boat looking for outcrops right not work.
Jim Tull: Years ago, I was at a Penrose conference.
Jim Tull: Some of you probably read some Nick grass papers.
Jim Tull: Nick was a really bright no structural geologists.
Jim Tull: ended up teaching a Kentucky at the end of his career, but he compared the southern appalachian so the northern appalachians and his comparison was a beautiful mansion in New England.
Jim Tull: And then he showed a picture of a an old house in Alabama that was covered with kudzu and that was his his comparison between New England, the southern appalachians.
barineau_clinton: Well, I think we're.
barineau_clinton: I think we're past our break so i'm gonna back up here and.
barineau_clinton: and take us all to stop 14.
barineau_clinton: yeah go ahead.
Josh Poole: hey oh i'm enjoying it so far i'm sorry we kind of bought be bopping in in and out of balance between other stops or not other stops other field trips and you know just general life things so I cut the very kind of some of ben's binstock there and.
Josh Poole: And I apologize if you guys went over this in detail and I missed it, but when you were talking about the end of the jacksons got quad into the.
Josh Poole: The date vocal quad and you said, the end of the bar, could you Would you mind elaborating on that if you talked about that I really apologize you don't have to spend time on that again if you've already done that but.
Ben Davis: No, no, no that's perfectly fine.
barineau_clinton: To go back to that that map.
Ben Davis: pass it yeah I think so.
barineau_clinton: Okay come on stop.
Ben Davis: So you this will actually work right here.
barineau_clinton: Okay, all right.
Ben Davis: So josh as as the jacksons gap comes down, you know it has that perfect kind of limit coming out of Atlanta, all the way down to jackson's gap and then you turn South there.
Josh Poole: Is.
Ben Davis: What we're interpreting is actually khawaja intruding into the the jacksons gap group.
Ben Davis: And instead of it being a fault relationship for their Banda in the day bill Maher i'm getting the band default more than likely tips out i'm really have any data of the four day event default as it goes down towards to lassie so theoretically, it could tip out there.
Ben Davis: That kind of answer your question.
Josh Poole: yeah I well I Joel abrams he and overlapped he matt damon quad i'm at the jacksons gap quad just to the north.
Josh Poole: With don Paul, and so you know we've been trying to tie together this what the hell is the reward.
Josh Poole: What does it mean I just falls apart here in Alabama.
Josh Poole: And you know we saw the same kind of classics that kind of hug i'm tracing advantage on my screen, but obviously no one can see that my cursor but but we saw the same kind of classic saw the band up to the north.
Josh Poole: To the North East but somewhere around jackson's gap, it seems to they seem to display and.
Josh Poole: The one that you have just below the G and jackson's gap.
Josh Poole: On your on your yeah that kind of classic just seems display straight towards Alexander city, so one of our thoughts was I don't know, maybe is attentional relay as far as timing I don't know if it was if it was a little late or super late, I really don't know but.
Josh Poole: yeah that is interesting, because actually still in Poland and rainy Catherine Tom Crawford have been talking a lot about the Elijah and the xena and the long island creek and their relationships, because.
Josh Poole: As you work as you could probably you guys have seen as you go up to the to the north, east.
Josh Poole: You get more of the medicine imitating groups of of the mcfaul but, as you work towards the southwest you just get into this giant see battling of co Asia and so yeah in long island pretty big of a Georgia so yeah um well, thank you yeah sorry I kind of went off on a different.
Josh Poole: tangent there but you're good yeah I appreciate it and yeah sorry for jumping in and we're going to repeat.
Jim Tull: that's what we want, but what I think what ben's been right about that what that tells you is the band default has to tip out.
Jim Tull: it's clearly domain if jackson's gaps or division of slurry in the band is clearly much younger than that, and so what that does is it constrains the displacement that you could put on the abandoned.
barineau_clinton: josh.
Jim Tull: Make that an extract slip ball yeah.
Josh Poole: You know I know that you've been having.
Josh Poole: You been.
Josh Poole: You know, Jim trying to reconcile is that actual like measurable measurable displacement it's it's something really difficult because there are you know these are.
Josh Poole: These are strike parallel a lot of these faults and so they're just it's different it's difficult.
Josh Poole: And packages.
Jim Tull: So if it tips out and there's no displacement on it jackson's have then how much displacement, can you put on it elsewhere.
Josh Poole: yeah that's it yeah great question.
Jim Tull: You can.
Jim Tull: You can hint it there, and put normal display smaller, which I think is still a possibility.
Josh Poole: yeah.
Josh Poole: No, I agree, I think.
Josh Poole: There is a note.
Jim Tull: Here yeah.
barineau_clinton: josh I was gonna say suggest, I think you were on this trip, but the 2012 Alabama society trip if you go back and read there's a there's an article in there by.
barineau_clinton: Total Campbell or Campbell and tal Ki Campbell and that's exactly what they propose is that those kind of classic zones basically relay the abandoned with Alexander city with the tip of the Alexander city and the tip of the band default so.
Josh Poole: I remember yeah I remember talking with keely about that because I was just when I was starting this project so yeah I do remember that now yeah good point.
barineau_clinton: I move forward so i'm gonna.
Josh Poole: Get Thank you, I appreciate it.
Josh Poole: yeah it's been good so far yeah so.
barineau_clinton: Alright, so stop 14 and let me.
Josh Poole: look up your break.
Josh Poole: You.
Josh Poole: Know that's okay.
Ben Davis: You guys alright.
barineau_clinton: So let's uh we're going to zoom in here to the vicinity of lucha poke Alabama.
barineau_clinton: So this is kind of near the southern end of the area we're working in and in ben's going to go through a number of stops here and really take us through a kind of typical.
barineau_clinton: mapping sequence in here, and so, but we'll start start your guests here and 14 a on saga has your week been is that right.
Ben Davis: Yes, started started 14 day okay all right.
barineau_clinton: So, so this is own song hetchy creek and you can see all the gorgeous exposures there that bins about talk about so.
Ben Davis: Okay, so we transition around the hinge of the classy send form and carry that jackson's gap group stratigraphy into the open, like a group you're in the village poker formation, which is a massive my acacias just outcrop or unit.
Ben Davis: And within it has a good court site that you can correlate with all the other court sites that we mentioned previously it's called the saga hace court site and where.
Ben Davis: clint put us on Google earth right there click can you pop back over to yeah.
Ben Davis: So just over this bridge right here, this is soccer hetchy creek, and this is in the I believe the not a saga seven a half minute quad just west of you guys in auburn i'm right there where the actual stop marker is that's on the farm ville Meta Granite.
Ben Davis: it's a really nice pavement outcrop of it and just north of this this image on the creek you transition out of the intrusive a unit there, and you start picking up courtside members and so we'll talk more about that in a second.
Ben Davis: Okay, so this is a map from, I guess, a field guide book that Jim sears did an 81 but it's a really good detailed geologic map of those like a group.
Ben Davis: And yeah it's very helpful, but as you cross out of the database complex you come across, I believe, on his Matthew maps, that is, the debbie on formation.
Ben Davis: On which is basically the ropes creek as you cross out of the ropes creek you come over the stonewall line, which is that southern bounding fall to the database complex and you enter into.
Ben Davis: These my case of shifts and courtside units they're all included by that farmville Meta Granite and so that's what we're going to talk more about.
Jim Tull: them, I think the Court sites are shown in black Is that correct.
Ben Davis: yeah the Court sites are the little black stringers.
Ben Davis: I believe, on his map.
yeah.
Ben Davis: Okay next slide.
Ben Davis: Okay, so if we jump back onto Google or for a second.
Ben Davis: And we go over to those other stops.
Ben Davis: This is a really nice traverse through the ropes creek crossing over an area where the stonewall line runs through on and then you start picking up some of these these open like a group street trigger fees, the saga hetchy courtside a little bit of shifts.
Ben Davis: and
barineau_clinton: really bad photo.
Ben Davis: And then you, you can actually put your hand on the the contact, where the Farm Bill is intruding into the courts, I and that's what I have here in these photos.
Ben Davis: But bentley another 1970s, they introduced the term launch polka just for an approximately one 1.2 kilometer thick sequence of kind night's sleep tonight bearing politik schist interlude with the saga hetchy courtside.
Ben Davis: Then Meta grey lackeys thin and fit the lights lying structurally below the stonewall line and above the auburn Nice or the auburn information.
Ben Davis: In terms of saga hetchy courtside it wasn't coined until sears and others in 1981 did work with it, and it was actually in western Lee county on where we are right now, and on the Google earth the shift is dominant coarse grained.
Ben Davis: It it's a the mineral simulators that you're gonna find inner kind night soma night garnet pleasure clays muscovite by a tight on courts occurs in the.
Ben Davis: As a resistant discontinuous set of court sites that we were talking about when we're correlating with other street here in the jacksons gap group.
Ben Davis: That range and thickness from about two meters to as much as 45 meters and with.
Ben Davis: Are in length.
Ben Davis: sears and others in 1981 they recognized the the Court site is a expose this continuously over a distance of around 112 miles.
Ben Davis: From polk Alabama all the way into West central Georgia and so that area that clint was showing on the Google earth, you can see, on this map that I have here you're in the.
Ben Davis: you're in the purple on the top and that's the ropes creek and you can get good data there and eventually the data just kind of runs out as you go into basically a swampy area.
Ben Davis: And then, all of a sudden, you start picking up these court sites and shifts of the ledge poker for mason and then you can actually if you continue up.
Ben Davis: there's a road cut that he tried to show with the street view and that was where the the intrusive contact between the Farm Bill, and the local coach formation is, but this is a problem with the stone or stone wall line, you can get close to it.
Ben Davis: But you can't actually ever see and so.
Ben Davis: it's a kind of an issue, but hopefully areas closer to Atlanta, as we trace though black a group up to in this in the database complex up in to Georgia towards Atlanta.
Ben Davis: Now we're hoping to gain some new information there in southeast Atlanta.
barineau_clinton: I was just going to show you that same traverse here is starting out in the Farm Bill and then gradually moving into the saga hace.
barineau_clinton: And then eventually if you go far enough down this road you hit these outcrops.
barineau_clinton: A ropes creek which are visible in the in the River there too.
Ben Davis: yeah it's actually a nice little road as far as getting a roadside outcrops.
Ben Davis: OK, so the saga had record site it's thick or thin layered moderately my cases it's it's a white to buff color on like you saw in the photos.
Ben Davis: And there's compositional layering you can actually see my cases rich lemonade generally parallels the dominant just our city and surrounding units.
Ben Davis: Sure actually below the lunch poko formation in the lurch focuses in on this map it's this kind of pale yellow, that is, the other information.
Ben Davis: Also, known as the other nice consists of well full aided by tight Nice and muscovite by tight schist the unit was first described a bentley another in 1970 and was named the overnight shift referred to the nicest and shifts in the open, like a group lying structurally below the.
Ben Davis: lunch focus shifts.
Ben Davis: And above the 12 default, which is the southern bounding Member to the biker group.
Ben Davis: It was suggested by grimes 1983 that electric poke information is collected relative to the the jacksons gap group stuff which we've been talking about.
Ben Davis: Okay next slide.
Ben Davis: And so here is that same spot where the Farm Bill Granite crops out right on saga hetchy creek here's a on the right, you see an actual image of it it's a really good pavement you can actually I think on the next slide.
Ben Davis: There you go thanks to well defined fully ation within it.
Ben Davis: And if you actually can find areas where this the the payment gets into the water like on the next slide and you wet it, you can actually see some of these.
Ben Davis: These felled spars that crop out really nice, and so we got some of those for scale and you don't see these everywhere, the.
Ben Davis: The work that i've done with the Farm Bill Meta Granite is very limited, but this is, by far, probably one of the best outcrops that i've seen and it's just down the street from I believe a vulcan mind where they were mining the lunch or the Farm Bill in the Nada saga quad.
Ben Davis: And I think you can see that, from an aerial image.
Ben Davis: If we get full extent.
Ben Davis: There it is, and so the saga hetchy creek runs right on the backside of of that corey um it's a very large corey where they're getting the Farm Bill, out of.
Ben Davis: All right.
Do one more.
Ben Davis: Okay, so here's that map again that you've seen on from a if you look again separating the the database complex from the group is the stone wall line if you move closer to the Georgia line.
Ben Davis: The map on the bottom is for quads actually stitched together, and this is by far the closest that we've gotten to finding the stone wall line it was about 10 feet difference.
Ben Davis: On one side you had ropes creek and herbalife went through basically a dirt patch and then next thing you know you're in my case shifts in court sites of village poke formation and so you can see where these are on the index maps there.
Ben Davis: But it's just an issue.
Ben Davis: That we're faced with, and so, hopefully we can resolve that soon.
Ben Davis: Next slide and so again, this is the.
Ben Davis: The cannibal quad and the.
Ben Davis: The see what is this other man.
Ben Davis: that's the net South quad So these are other areas we don't have a lot of data separating these two, but you can see how intrusive the Farm Bill is into all these units.
Ben Davis: You don't really start picking up the the Meta Gray lackeys and the lunch polka information until you get closer to the Georgia line they start intermingling with the the Court sites in the shifts themselves.
Jim Tull: Then, then, since, since more cars on here, you need to point out these red map quads.
Ben Davis: Yes, these are ED map quadrangles um yeah these are.
Ben Davis: let's see kind of build that was Eric Parish and.
Ben Davis: Andrew Stevens did lynette south.
Ben Davis: But yeah.
barineau_clinton: questions on.
barineau_clinton: Questions look like a complex.
barineau_clinton: Very good, we it's good training for the next generation of geologic matters.
barineau_clinton: My we're gonna jump into our final section here, which is to jump over into the day, though, complex and know ben's going to talk a lot about that so we'll start here it stopped.
barineau_clinton: Which is.
barineau_clinton: No, sorry go back.
barineau_clinton: we'll start stop 15, which is the type section for the ribs creek yes.
barineau_clinton: And don't have a street view but a beautiful beautiful hero image of it, I know Ben has some photos.
Ben Davis: I do, and I believe that you're coming off.
Ben Davis: Okay, so.
Ben Davis: we've crossed over the stonewall line back into the the danville clip of there, and if you look at the the map on the left the purple unit is the red screen comfortable I the pink or the sort of pinkish, it is the camp hill.
Ben Davis: The yellow is the curriculum shift and the red or the ultra matrix suites that intrude into it the sort of other peach peach colored unit that's the the chatter safka the Franklin the rock males so on and so forth up there, but right now we're going to talk about sort of.
Ben Davis: In.
Ben Davis: county the type section for the ribs creek a actually crops out on ropes creek headless sewers mill and so that's what we're going to talk about next.
Ben Davis: Okay, so.
Ben Davis: it's the most extensive unit in the database complex it's been estimated to cries at least 40% of the the entire davao complex itself.
Ben Davis: If we expand that number into Georgia it's probably much probably a little bit higher but it's the basal unit and it's roughly.
Ben Davis: Nine to 10 kilometers thick it consists of delicate layered to massive and fibula consisting of point 123 millimeter thick alternating Hornby island and pledge.
Ben Davis: layers of fell site, you can see in this picture on the right of the pavement you can see, all these white streaks going across the the outcrop itself.
Ben Davis: Those are layers of fell site that we interpret to be better, more photos right acidic ash it's actually interpolated within the infidel a man this suggest a massive by modal section resembling a marine volcanic deposit in a lot of the the maps that.
Ben Davis: we've seen from the southern appalachians they break out the where's will shift, which was actually a field trip stop for the Georgia geological society, a few years ago.
Ben Davis: We interpret the waves mill to since it maps right into the.
Ben Davis: screen it's just more than likely the upper most member of the ropes Kirk and.
civilized.
Ben Davis: So at this at this.
Ben Davis: Do you want to go to the Google earth image.
Ben Davis: So you can just see how large this pavement is that's the robes creak creak itself and it's going over a spillway there.
Ben Davis: The spillway was put there because this used to be a historic grist mill and luckily a big time loria from I think Birmingham came in and restored it and.
Ben Davis: kind of help preserve all this, but it's a fantastic outcrop if you ever get a chance it's not far from all over For those of you that live there.
Ben Davis: it's it's beautiful but it's it it's called the sewers Milton the Thornton quadrangle of Alabama.
Ben Davis: It the ropes creek itself occurs as an equal granular find a medium green and filet it has a conspicuous delineation and fully defined by the abundance of porn blend you can just see how long it is almost looks like a parking lot now when you're.
Jim Tull: ready for non southern appalachian gel just.
Jim Tull: That outcrop on the right is what i'm footlights look like.
Ben Davis: Oh yes, yes.
Ben Davis: More times than more more times, not the the photo on the right is what you will find it the when the.
fibula.
Michael Thonis: Any.
Ben Davis: Excuse me.
Michael Thonis: It iron standing Is that why it's red.
Ben Davis: yeah it basically turns to a nasty punk rock and hopefully it's not raining because if you're driving in it and you get stuck if you're going to get money.
Ben Davis: But the if you look at a fresh piece of the ropes creek it usually ranges in color from dark green to grey and in the photo on the right it's easily identified, because it has that dark red characteristic Sapper light on and like I said it's real nasty when it's what.
Ben Davis: Next slide.
Ben Davis: Okay, so we were actually able to pull some some zircons out of these fell site layers.
Ben Davis: And although there was some discordance were able to get a an eight an average of the 10 oldest grains that ranged a 444 million years plus or minus four now the ropes creek is inserted by the capital, so that helps constrain the actual age of the rope screen.
Ben Davis: But this sample was taken from not just up the road from the type section here in the foreign quadrangle although there was noticeable lead loss, the best estimate is that for 44.
Ben Davis: And yet so more work needs to be done with this, the you can see, the different layers that they're not all the same thickness there's things stringers and then thick layers of this.
Ben Davis: ride to citic ash within the ribs cream.
Ben Davis: Next life.
Ben Davis: So if we transition over to the Georgia state line.
Ben Davis: With Alabama this is West point lake This is where the game up the chattahoochee river, as it comes out of Atlanta.
Ben Davis: right here just below the dam in this red oval along the the chattahoochee river and a long, though the lakeshore there.
Ben Davis: Are outcrops of what's called the West point launch and the West point milan's I believe was first talked about by sears and others in 1981 and they he considered it and.
Ben Davis: Hopefully, like light in nature, but we have some some new insight on that the note the the yellows unit to the left just across the state line there.
Ben Davis: that's a chloride muscovite schist where we found small, isolated boulders.
Ben Davis: Outwardly outboard motor size outcrops have weathered gabrielle and, although this side of the River was highly weathered uncovered an overburden and this most likely represents an extension of the West point in the launch so this map needs to be updated here.
Ben Davis: Next slide So if you actually flip to that sad image right there, you can see those red circles, those are outcrops of the the monitor itself on the right are photos of that field photos.
Ben Davis: it's characterized as an aloe lister stroem due to the exotic nor rights and met governor is found within the quadratic 10 light ships matrix it's uncertain the exact thickness of this launch due to cover and overburden and, as this is a army corps of engineer lake.
Ben Davis: right there close to the damn they like to protect the the shoreline from erosion and weathering so they dump a bunch of concrete on the shore there so i'm not sure if some of these these outcrops are still there, but.
Ben Davis: I was able to get some really good photos when I was mapping this area, the fact that this formation is within the ropes creek and feeble I.
Ben Davis: can suggest the existence of a internal unconformity the majority of the boulders have been trained that are trained in the Milan itself are often of ultra magnetic origin.
Ben Davis: and had to have been zoomed to the surface during an original event on that took place during the formation of the REPS creek and filet.
Ben Davis: next one.
Ben Davis: Alright, so this is some of the chemistry, that you can see, on the right, the the spillway there and Dr toll standing up there.
Ben Davis: But on the left is the the chemistry, and these are extended trace element diagram spider diagrams and you can see, in both the the launch itself and the ropes creek we have well defined.
Ben Davis: Volcanic arcs signatures depletion and IBM and tantalum enrichment and lead and then moderate.
Ben Davis: highfield shrink elements over on the right, this is exactly what you would see there what is typical of volcanic arcs and so that worked out really nicely.
Ben Davis: Alright, any questions.
barineau_clinton: No questions will jump out here, take a look at our overall region, one last time.
barineau_clinton: And so we we spend from Georgia Alabama and now we'll drop back in to our last.
barineau_clinton: Our last field station which is here in or davao Alabama.
barineau_clinton: And is going to talk a little bit at the camp Hill and then we'll be happy to have kind of a broad scale summary discussion answer any questions so.
barineau_clinton: I saw up 16 is here for free camp hill.
barineau_clinton: And you can actually make out the outcrop no Street View here, but you can actually make outcrop in the satellite image so.
barineau_clinton: Then i'll turn it over to you.
Ben Davis: alrighty, so this is a massive payment outcrop of the camp hill that just in the middle of the woods you actually have to hike back in there to get to it.
Ben Davis: The campaign Nice is a weekly fully very coarse grained Nice and it's actually tone, the lyric and composition.
Ben Davis: it's got a signature light Gray coloration and it has no Alkali felts bar.
Ben Davis: Which is really useful when trying to figure out what you know what nice unit you're in when you have the chatter software creep because chatter safka and the rock mills and Franklin and stonewall.
Ben Davis: Nice, they all have a beautiful microclimate in them so it's really, really, easy to sort of differentiate those two in the field.
Ben Davis: Like you said it's totally to can composition, the the primary minerals in the camp hill nicer courts pledge Horn blend.
Ben Davis: Sometimes Horn blend by a tight and muscovite and although the Granite displays both buy titan muscovite in some samples garnet it is usually found is being extremely rich next slide.
Ben Davis: Okay, so this is a when he showed you the Google earth image, the the structural symbol right there is that that that actual outcrop.
Ben Davis: And up in the oval there you go.
Ben Davis: So this is in the capital, seven happened at quadrangle hotel coos county you can see, the actual hand simple outcrop image of the campaign nice there it's got a good fully ation to it.
Ben Davis: Where that outcrop actually sits is on an old.
Ben Davis: railroad line that they just built houses long so it's pretty cool next slide.
Jim Tull: yeah let me, let me stop the bin go back.
Jim Tull: For those of you that have worked in the southern appalachians notice those Northwest dips this is on the east flank of the tallahassee simple on and.
Jim Tull: We don't see very many Northwest dips and most of the field trip stops that we've looked at.
Jim Tull: Sorry, been.
Ben Davis: No, no you're good that was good to point out, and so you can actually see it right here, this is where the outcrop this would be I guess the the street view of that out crowd.
Ben Davis: it's quite large the trying to find pavement outcrops of the capital are kind of hard in the actual campaign quadrangle, but if you move further south toward the foreign quad and you start getting into some really large scale payment outcrops of this.
Ben Davis: Next slide.
Ben Davis: So according to Nielsen 1987 both camp Hill and shadow safka contains xena let's have an uber light and shift, which is evident from when we're mapping in the campaign quad you could actually see all this on they and their intrusive into the the decor complex next slide.
Ben Davis: So we were able to get zircons out of the camp hill to good samples from the the southern.
Ben Davis: Southern portion of the capital quadrangle got ch.
Ben Davis: And they they yielded ages between 446 and 448 all plus or minus two so there's a pretty concise amen put that as a middle order vision granted toy.
Ben Davis: Previous work on whole rock rubidium strontium on the Franklin Nice that try to soccer creek equivalent by ceiling cash in 1990 yielded ages between for 62 plus or minus 2.
Ben Davis: million years and so both dating techniques do similar ages.
Ben Davis: The chatter soco we were able to get zircons out of it and yield it for 61 plus or minus four so that's pretty on point with the work they did with the rubidium strontium you can see in these these photographs here the a is the camp Hill and there's only pledge found in in.
Ben Davis: Those samples, but if you look at the chatter stop you creek and the Franklin and the stonewall um there's massive microclimates it's really pretty, especially in hand sample you can see, it sometimes without even a hand lens so it's a pretty cool granted boy.
Ben Davis: Yes, so on this one.
Ben Davis: we're going to switch from the fell six and talk briefly about the the main topic and alternative rocks on so this unit and read I you see the UFC I label that the ultra mega complex, this is where the DAS mountain and slaughters gabrielle would actually crop out.
Ben Davis: And I think we have a stop there to donate.
Ben Davis: So you can see the contours there were dos mountain is it's actually a pretty significant amount of.
Ben Davis: elevation compared to the surrounding area, this is in the middle of some some timberland that they're actively logging so there's a network of roads that were able to use to our benefit and get around and actually get some good samples, when we were mapping here.
Ben Davis: If you actually on the the the DAS mountain itself, as you go up you keep crossing into sills layered intrusions and dykes approx night and all right, all the way up to the top and then surrounding all that is the slaughters gabrielle, which is very nice together again if.
Ben Davis: Next slide.
Ben Davis: So this is from Nielsen and stone 1986 on they actually did some pretty good detailed work with the the DAS mountain electromagnetic stuff.
Ben Davis: You can see what that looks like from the surrounding area it's kind of just a hill that pops up out of the out of nowhere.
Ben Davis: But it's layered proxy nights and all rights that you can find a minor acting like shift around there the sliders Gaborone surrounds it and we're in that photo i'm standing in the vertical is schist looking across the sliders gabrielle towards the the nor rights in the proxy nights.
Ben Davis: next one.
Ben Davis: And so, if we look at a more broader thing or a broader scale on where you trace this stuff into Georgia, you can see more ultra matrix suites that reside within the database complex, you had the morning creek mode approx night, which is in the Fayette county Georgia.
Ben Davis: it's a good CPS op X it's about 5050 for orthopedic seen Kleiner period seen really beautiful rock.
Ben Davis: Now, if we look over and the Woolsey ultra matrix suite which spelling Arielle did a good bit of work there on on the flanks of the ultra mythic sweet itself, you can get fully aided proxy tonight.
Ben Davis: And as you move towards the core of bell traumatic C suite it's not fully it at all, and it was really cool to see that because we didn't get to see that when we're mapping the DAS mountain area.
Ben Davis: Next slide.
Ben Davis: Okay, so going back to sort of the relationship between the chatter chatter soft creek Nice and the ultra magnetic units.
Ben Davis: You can see cross cutting relationships between these two in the buxton and camp hill seven and a half minute quadrangles A and B are from the campaign quad and C and D are from the button quad.
Ben Davis: Note the cusp eight low rate geometry and be that suggests that the mythic automatic sweet wasn't fully cooled during the the intrusion of the shadow soft creek Nice on so that kind of helps put a timing to things.
Ben Davis: And on the bottom, those are chatter soft creek diets that are cutting across approximate.
Ben Davis: This is major element chemistry that we got out of.
Ben Davis: The rocks in the database complex on the left is si O to wait percent for the celtics and on the right it's NGO on for the matrix and ultramarathon crocs they.
Ben Davis: Next slide.
Ben Davis: There we go, so if we look at the the ultimate big rocks with the ropes creek and the West point launch we had really good Arc signatures volcanic arcs signatures on with the ultra rich rocks we're still getting some of those signatures.
Ben Davis: And I was able to break out the the rocks and Alabama from the rocks and Georgia but you're still getting Nairobi and tantalum depletion and enrichment and lead.
Ben Davis: And pretty moderate high field strength elements, the sawtooth pattern that you see on the right, where it's supposed to be sort of more flatlined it's probably attributed to an analytical error on just to point that out next slide.
Ben Davis: And so, this is a comparison between the ribs creek and the West point milan's with the fell six.
Ben Davis: And next one.
Ben Davis: So if you break all these out into sort of a looking at the the tectonics of everything the ribs creek and fibula in the West point in the launch they all plot.
Ben Davis: In what you'd expect for volcanic are fully addict.
Ben Davis: Primarily, fully attic and also plotting as within continental art if you transition to the fell six the fellowship rocks are plotting primarily in the volcanic art Granite.
Ben Davis: Which is nice and it fits with everything else, and you can see, on the the ternary is on the right.
Ben Davis: The primarily all of the samples are plotting in the volcanic art field, some of those older samples that are plotting in within plate could be attributed to the analytical techniques that they were using but majority is volcanic Arc.
Ben Davis: And i'll take questions.
barineau_clinton: That is our final field trip stop and so we're happy to take questions on any part of the field trip from the talladega bill, all the way down through the into the inner Piedmont.
Jim Tull: Is that Alabama.
barineau_clinton: Yes.
barineau_clinton: On a good day.
TOM HANLEY: So those those peroxide.
TOM HANLEY: Those are the cumulative the base of.
TOM HANLEY: The volcanic complex, I guess, or are they more like oh feelings.
Ben Davis: Now there, we can interpret them to be our cumulus rocks that inserted into the the table complex there.
Michael Thonis: So what do you each have coming up related to this.
barineau_clinton: been what are you in the field again.
Jim Tull: Any any.
Jim Tull: Good yeah almost a year.
Ben Davis: yeah.
Ben Davis: trying to get into the field has been been exceptionally hard during during code and everything with a.
Ben Davis: All the quarantining and everything, but our future work is going to be in southeast Atlanta towards the conyers area.
Ben Davis: we're going to try and trace the the boundary with between the doorbell complex and open like a group up there with the stonewall line so that's our newest add map sort of venture, but other than that i'm trying to narrow or pin down the.
Ben Davis: provides and stuff in jackson's gap it'd be nice to get back on the lake and sort of hash some of that stuff out, so we can kind of resolve that issue.
barineau_clinton: yeah i'll just i'll point out really for for men and Gemini and a lot of people were in this area.
barineau_clinton: This relationship there to relationships, one is what happens when you jump across the chattahoochee fault, and we have some preliminary data from here, and this is basically it's a hatchet refers to it as the Western to glue terrain, is to leave a false formation and.
barineau_clinton: And the question is, is it related to these black art sequences over here at least some of the preliminary data that we have suggest it might be.
barineau_clinton: And then, in the western European law which hacker Patrick versus the eastern to glue which has the same photography you get into the false because it's weird as a stone wall, I actually go, and so this is kind of a tentative.
barineau_clinton: construct of where it might go I know ben's working on that I have a graduate student working on it and really trying to pin down, where is this boundary between the date bill and the the pool falls, and what is the relationship between the two.
Beth McClellan: Because I have a question.
Beth McClellan: My video on so I can see all um I don't want you to have to rehash the whole field trip, but there was so much information here so um can you just briefly review your evidence for the timing of the faulting, especially in talladega built in the blue Ridge.
Beth McClellan: And how it's related to metamorphic ISM.
Jim Tull: yeah we're working on it.
Jim Tull: If I can ever get any my co authors to look at it we're working on a draft of a paper about that beth.
Jim Tull: They tell all of these these faults, that the talladega carville fall, which is the Western boundary that holland's Lon the altoona fall and another fault in in the.
Jim Tull: Around the rim of the mulberry rock recess, which we call the burn hickey rich fall, which is probably the same as the holland's landfall all of these faults or post metamorphic.
Jim Tull: And they're fair they're bringing fairly cold rocks.
Jim Tull: towards the Northwest.
Jim Tull: And all of these faults cut obliquely through metamorphic fabrics and through the strategic fee so they're not being affected by any internal and I saw trapeze they they seem to be treating the spreadsheets as.
Jim Tull: mechanically isotopic blocks and they're all allegheny and the like, I said the the talladega fault, though the carnival fault at the way down there in the southwest in that window cuts into Mississippi and rocks and then it does the same thing had.
Jim Tull: rock mark Georgia cuts into mississippian rock so we know that's and it cuts structures that are probably Pennsylvania so that's probably a permian fault.
Jim Tull: And that's except for the hill be thrust which which are familiar with that's the oldest fault there, then we move back to the hollins line.
Jim Tull: And that big window that you see down in the southwest the what we call a Kelly mountain window or half it's a breached window that those folders that produce that window or decapitated by the horns line.
Jim Tull: And so it's a younger fault, then the TV carville fault, and then the altitude default is we show cuts the hollins line and it cuts the carters ville Anna form which falls Pennsylvania rocks so those three major threats are clearly allegheny and.
Jim Tull: And they cut through the fabrics they they cut through ice and grants.
Jim Tull: So there and they're all out of sequence so they're really strange.
Jim Tull: That they do that but they're basically they're telescoping that back art basin after it had been polly deformed and metamorphosed.
Beth McClellan: Thanks.
Jim Tull: Okay beth while while you're there.
Jim Tull: How are things in red for what's the weather like.
Beth McClellan: Well, we thought we had spring and then we just had a sphere I think for tour 22 couple nights ago.
Beth McClellan: But it's on the warm up so.
Beth McClellan: we'll see if we can get without having litter again.
Jim Tull: So how.
Jim Tull: How have you survived zoom teaching.
Beth McClellan: crew.
Beth McClellan: it's been a job.
Jim Tull: You don't have to answer that.
Beth McClellan: Here so yeah it's just you know i'd never taught virtually before and had never used zoom before the hardest was metrology last spring, when we had to just you know, everybody left campus and I had to somehow finish up the trilogy and.
Beth McClellan: I took it in section photos and made.
Beth McClellan: Plans online, but it was all.
Jim Tull: That it happened to me as well during structure and I usually teach with a whiteboard and not powerpoints in that class, and so I had to scramble.
Jim Tull: To try to make up.
Jim Tull: For the second half, and i've been doing that ever since it's no fun i'm ready to get back in the classroom yeah.
Beth McClellan: Well we've all learn new skills.
Jim Tull: skills that I hope never use again.
Jim Tull: Well, thank all you guys for coming it's been fun yeah.
Ben Davis: Thank you.
Beth McClellan: Really.
Michael Thonis: Thank you, excellent Thank you.
barineau_clinton: Thanks to all of you.
Josh Poole: Thanks guys great job.
Van Burbach: That was great yeah.
Josh Poole: Thanks was good, seeing you.
yeah.
mark carter: Great trip guys see everyone till the next meeting.
Jim Tull: yeah mark start start wearing some shoes, if you get a chance man.
mark carter: How will I will well I like it's in the last few days.
mark carter: But it is.
mark carter: it's more than backup so i'm going to.
Ben Davis: expect nothing less.
Jim Tull: hey mark start.
Jim Tull: start going again, and you know, we need to see you sometime.
mark carter: yeah I will, and we will next time we get together, we can have some home brews or you know, I was thinking about that earlier, what we have.
mark carter: to retire.
mark carter: What Nick se is going to be in harrisonburg right.
Jim Tull: I haven't looked at.
RISE- Audrey Heun GSA: know that is se.
RISE- Audrey Heun GSA: Se so next one is um.
RISE- Audrey Heun GSA: it's a joint meeting with snore central.
mark carter: Okay, all right.
Jim Tull: yeah yeah.
But Harris.
mark carter: Right sometime.
RISE- Audrey Heun GSA: I think I got bumped again because the the southeast ne.
RISE- Audrey Heun GSA: restaurant is going to happen now in 2023.
RISE- Audrey Heun GSA: gotcha so they got bumped to I think 2024 again.
mark carter: Well, my point my point is that, at some point in time y'all if y'all can come up here and when y'all do either either word resident or harrisonburg you know it's fairly close so.
Jim Tull: Well i'll plan to stay at your House during the rest of meeting.
mark carter: room a little bit farm a little bit closer to Harrison burn but everybody's welcome.
mark carter: It was always open for free so.
mark carter: Alright guys i'm gonna i'm gonna get on out of here so.
Josh Poole: Thank you.
Everybody.
Jim Tull: Thank you.
RISE- Audrey Heun GSA: Alright job everybody bye.
barineau_clinton: Thank you.
Jim Tull: Alright guys.