Sheeprock Ridge SR-39: Wuchiapingian, Nevada
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Crinoidea
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Crinoidea indet.
Miller 1821
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unclassified
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Bryozoa indet.
Ehrenberg 1831
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| "Ramose bryozoa" | ||||||||||
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Stenolaemata
- Fenestrata
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Fenestrata indet.
(Elias and Condra 1957)
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| synonym of Fenestelloidea | ||||||||||
| "Fenestrate bryozoa" | ||||||||||
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Rhynchonellata
- Athyridida
- Neoretziidae
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Hustedia elongata
Cooper 1953
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| "n. ssp." | ||||||||||
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Rhynchonellata
- Athyridida
- Athyrididae
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Composita mira
(Girty 1899)
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Strophomenata
- Productida
- Productidae
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Yakovlevia multistriata
(Meek 1860)
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Strophomenata
- Productida
- Paucispiniferidae
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Liosotella delicatula
Dunbar 1955
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| recombined as Anemonaria delicatula | ||||||||||
| see common names | ||||||||||
Geography
| Country: | United States | State/province: | Nevada | County: | Elko |
| Coordinates: | 40.4° North, 114.8° West (view map) | ||||
| Paleocoordinates: | 14.4° North, 36.7° West | ||||
| Basis of coordinate: | based on nearby landmark | ||||
| Geographic resolution: | local area |
Time
| Period: | Permian | Epoch: | Lopingian |
| Stage: | Wuchiapingian | 10 m.y. bin: | Permian 4 |
| Key time interval: | Wuchiapingian | ||
| Age range of interval: | 259.51000 - 254.14000 m.y. ago |
Stratigraphy
| Geological group: | Park City | Formation: | Gerster | ||
| Stratigraphic resolution: | group of beds | ||||
| Stratigraphy comments: 39 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. | |||||
Lithology and environment
| Primary lithology: | "limestone" |
| Includes fossils? | Y |
| Environment: | marine indet. |
Taphonomy
| Modes of preservation: | body,replaced with silica |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection methods: | bulk,chemical,field collection |
| Reason for describing collection: | biostratigraphic analysis |
Metadata
| Database number: | 39760 | ||
| Authorizer: | D. Bottjer | Enterer: | M. Clapham |
| Modifier: | B. Allen | Research group: | marine invertebrate |
| Created: | 2004-06-05 16:40:48 | Last modified: | 2020-05-18 08:54:44 |
| Access level: | the public | Released: | 2004-06-05 16:40:48 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 10679. | 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] |