Where: Tooele County, Utah (40.1° N, 113.8° W: paleocoordinates 13.7° N, 36.2° W)
• coordinate based on nearby landmark
• local area-level geographic resolution
When: Gerster Formation (Park City Group), Wuchiapingian (259.9 - 254.2 Ma)
• 255 feet above base of measured section.
•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; peloidal, shelly/skeletal, silty, cherty/siliceous wackestone
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 39552: authorized by David Bottjer, entered by Matthew Clapham on 30.05.2004
Creative Commons license: CC BY (attribution)
Taxonomic list
Bivalvia | |
Pectinoidea indet. Rafinesque 1815 scallop | |
Bryozoa | |
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Strophomenata | |
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Ctenalosia fixata Cooper and Stehli 1955 | |
Quadrochonetes "n. sp. A" Stehli 1954
Waagenites "n. sp. A" Paeckelmann 1930 | |
Rhynchonellata | |
Cleiothyridina "n. sp. A" Buckman 1906
Cleiothyridina "n. sp. B" Buckman 1906
Composita mira Girty 1899 | |
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"Dielasma phosphoriense" = Dielasma phosphoriensis Branson 1930
Plectelasma "n. sp. A" Cooper and Grant 1969
Plectelasma "n. sp. B" Cooper and Grant 1969 | |
Xestotrema pulchrum Meek 1860 |