Where: Elko County, Nevada (40.3° N, 115.2° W: paleocoordinates 14.4° N, 37.0° W)
• coordinate based on nearby landmark
• local area-level geographic resolution
When: Gerster Formation (Park City Group), Wuchiapingian (259.9 - 254.2 Ma)
• 145 feet above base of Gerster Formation.
•Gerster Formation is correlated with the upper Phosphoria Formation (Rex Chert, Retort, Tosi) and other upper units in the Park City Group (Franson, Ervay). Those units are now Lopingian in age, following a latest Capitanian U/Pb age of 260.57 Ma in the upper Meade Peak Member. The upper age of the Gerster is unclear, and it may span much of the Lopingian, although the top is unconformable (overlying units are Smithian) so some or all of the Changhsingian may be missing. For now, all collections are assigned a Wuchiapingian age.
• group of beds-level stratigraphic resolution
Environment/lithology: marine; shelly/skeletal packstone
Size class: macrofossils
Preservation: replaced with silica
Collection methods: bulk, chemical,
Primary reference: B. R. Wardlaw. 1977. The biostratigraphy and paleoecology of the Gerster Limestone (Upper Permian) in Nevada and Utah. U.S.G.S. Open File Report 77(470):1-125 [D. Bottjer/M. Clapham/M. Clapham]more details
Purpose of describing collection: biostratigraphic analysis
PaleoDB collection 39774: authorized by David Bottjer, entered by Matthew Clapham on 06.06.2004
Creative Commons license: CC BY (attribution)
Taxonomic list
Crinoidea | |
Crinoidea indet. Miller 1821 Sea lily | |
Bryozoa | |
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Rhynchonellata | |
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Cleiothyridina "n. sp. A" Buckman 1906
Cleiothyridina "n. sp. B" Buckman 1906 | |
Dielasma phosphoriense Branson 1930 | |
Xestotrema pulchrum Meek 1860 | |
Cenorhynchia "n. sp. A" Cooper and Grant 1976 | |
Strophomenata | |
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Bathymyonia nevadensis Meek 1877 | |
Bivalvia | |
Girtypecten sp. Newell 1938 scallop | |
Aviculopecten sp. M'Coy 1851 scallop |