|Northeastern Section (45th Annual) and Southeastern Section (59th Annual) Joint Meeting (13-16 March 2010)|
|Paper No. 55-3|
|Presentation Time: 1:30 PM-5:35 PM|
TRACE FOSSILS IN THE TIOGA ASH HELP DECIPHER CHANGING PALEOENVIRONMENTAL CONDITIONS IN THE MIDDLE DEVONIAN OF WEST VIRGINIA
MCDOWELL, Ronald R.1, AVARY, Katharine L.2, LEWIS, J. Eric3, and WILSON, Keri L.1, (1) West Virginia Geological and Economic Survey, 1 Mont Chateau Road, Morgantown, WV 26508, email@example.com, (2) West Virginia Geological and Economic Survey, Morgantown, WV 26508, (3) Oil and Gas, West Virginia Geological Survey, 1 Mont Chateau Rd, Morgantown, WV 26508|
The Middle Devonian (mid-Eifelian) Tioga Ash occurs throughout the central Appalachian Basin, both in outcrop and subsurface. In eastern West Virginia, it forms a marker horizon comprising multiple, water-lain ashfall episodes spaced closely in time. The Tioga interfingers with top of the Needmore Shale, a dark grey, organic-rich, marine unit, and is overlain by the Millboro (≈ “Marcellus”) Shale, a black, organic-rich, marine unit. The Needmore contains a moderately abundant, normal marine fauna of articulate brachiopods and trilobites with diagnostic, intensely bioturbated horizons dominated by Chondrites sp. The Millboro, noted for its depauperate fauna, typically contains miniature adult brachiopods, styliolines, and cephalopods; it is nearly devoid of trace fossils. These two shales clearly represent major differences in environmental conditions.
Northeastern Section (45th Annual) and Southeastern Section (59th Annual) Joint Meeting (13-16 March 2010)
General Information for this Meeting
|Session No. 55--Booth# 63|
Eastern Ichnology: Advances in Paleoenvironmental Applications of Trace Fossils (Posters)
Sheraton Baltimore City Center: International ABCDF
1:30 PM-5:35 PM, Monday, 15 March 2010
Geological Society of America Abstracts with Programs, Vol. 42, No. 1, p. 142
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