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Found 92 matches
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  1. ... in the first major field project of GLG 240 dealing with students' perception of terrain and geologic relations. The exercise centered on SP Crater, a young cinder cone and flow north of Flagstaff, AZ. The goals of the exercise were to increase 1) student confidence in self location, 2) recognition ...
  2. ... WFPC2 did not indicate the presence of red hematite in Meridiani Planum at scales of 10-20 km/pixel. Opportunity came to rest within a 20 m diameter crater dubbed Eagle. Early multispectral visible and near infrared observations by the roverís Pancam of in situ rocks exposed on the inner wall of Eagle ...
  3. ... the structure. Within the structure, the bedrock aquifer is hosted by carbonate and granitic impact breccias and is recharged through overlying crater-fill Jurassic red beds and karstic evaporites consisting of gypsum, anhydrite and minor glauberite. From the karstic uplands to discharge points 10 km ...
  4. ... of the outer ring consists of low ridges and broad valleys that developed on a carbonate impact breccia. This ring marks the extent of the transient crater. The inner and outer rings are nearly coincident on the southwestern margin, where Mississippian strata are faulted and cut out below the sub-Pennsylvanian ...
  5. ... Rovers Spirit and Opportunity have been conducting geologic exploration of the martian surface since January, 2004. Spirit landed at Gusev Crater, and for the first 160 sols of its mission it explored the basalt-covered plains of the crater floor. After a traverse of over 3 km, Spirit arrived at the ...
  6. ... . Based on geochemical data, they are linked respectively to the Popigai (Siberia, 100 km in diameter) and the Chesapeake Bay (80 km in diameter) craters, dated at 35.7 and 35.5 Ma. Less precisely constrained by isotope-dating, the smaller Mistastin, Wanapitei and Logoisk craters may be part of the same ...
  7. ... into the ocean basins excavate the mantle, the dominant mineral in impact spherules will be olivine. In the ejecta from a 150 km wide, late Miocene crater in the mid-Pacific (Ewing crater), the dominant spherical form is a serpentinized olivine spherule. This spherule type may be the most common form ...
  8. ... southeastern Australia. Luann Becker and Bob Poreda have confirmed impact with a new radiometric date, impact breccia, and maskelynite in the Bedout Crater, offshore Canning Basin, Western Australia, first proposed as an impact structure by John Gorter in 1996. This crater is comparable in size with ...
  9. ... -6305, phil.christensen@asu.edu The Mini-TES instruments on Spirit and Opportunity have studied the mineralogy and thermophysical properties at Gusev Crater and the Meridiani Plains. At Gusev undisturbed soil spectra closely match MGS TES bright-region dust spectra, with features interpreted to be due ...
  10. ... , and JANZ, Horst, Institute for Geochemistry, Univ of Tuebingen, Wilhelmstr. 56, Tuebingen, D-72074, Germany The Steinheim basin is a 3.5 km wide crater in Upper Jurassic limestone of the Swabian Alp formed by a meteorite impact during the middle Miocene (~14.3 Ma). The crater basin was successively ...

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