Nopah Formation, Sample 2294-CO, Member A: Steptoean, Nevada
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Agnostida
- Agnostidae
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Homagnostus obesus
(Belt 1867)
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Agnostida
- Diplagnostidae
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Pseudagnostus communis
(Hall and Whitfield 1877)
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Trilobita
- Ptychopariida
- Solenopleuridae
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Minupeltis conservator
Palmer 1960
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Trilobita
- Ptychopariida
- Elviniidae
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Dunderbergia bigranulosa
Palmer 1960
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Trilobita
- Olenida
- Pterocephaliidae
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Prehousia semicircularis
Palmer 1960
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Cernuolimbus orygmatos
Palmer 1960
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Cernuolimbus semigranulosus
Palmer 1960
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Inarticulata
- Inarticulata
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Inarticulata indet.
Huxley 1869
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| see common names | |||||||
Geography
| Country: | United States | State/province: | Nevada |
| Coordinates: | 39.0° North, 116.0° West (view map) | ||
| Paleocoordinates: | 33.0° North, 121.7° West (Wright 2013) | ||
| Basis of coordinate: | estimated from map | ||
| Geographic resolution: | small collection |
Time
| Period: | Cambrian | Epoch: | Furongian |
| 10 m.y. bin: | Cambrian 5 | ||
| Key time interval: | Steptoean | Trilobite zone: | Dunderbergia |
| Age range of interval: | 497 - 493 m.y. ago |
Stratigraphy
| Formation: | Nopah | Member: | Dunderberg Shale A | ||
| Stratigraphic resolution: | group of beds | ||||
| Stratigraphy comments: Listed as upper half of Dunderbergia zone | |||||
Lithology and environment
| Primary lithology: | poorly lithified "shale" |
| Secondary lithology: | shelly/skeletal lithified "limestone" |
| Lithology description: Dominantly shale interbedded with fossiliferous limestone | |
| Environment: | slope |
| Geology comments: Fossils only in limestones | |
Taphonomy
| Modes of preservation: | body |
| Degree of concentration: | -multiple events |
| Size of fossils: | macrofossils,mesofossils |
| Spatial orientation: | life position |
| Articulated whole bodies: | some |
| Size sorting: | poor |
| Fragmentation: | occasional |
| Temporal resolution: | time-averaged |
| Spatial resolution: | autochthonous |
Collection methods and comments
| Reason for describing collection: | biostratigraphic analysis |
| Taxonomic list comments:Upper half of Dunderbergia zone age; Trilobite systematics with some phosphatic inarticulates mentioned; however, this is probably an accurate portrayal of full fauna | |
Metadata
| Database number: | 75268 | ||
| Authorizer: | P. Novack-Gottshall | Enterer: | P. Hearn |
| Modifier: | P. Wagner | Research group: | marine invertebrate |
| Created: | 2007-10-03 12:26:26 | Last modified: | 2025-02-22 15:12:02 |
| Access level: | the public | Released: | 2007-10-03 12:26:26 |
| Creative Commons license: | CC0 |
Reference information
Primary reference:
| 25421. | A. R. Palmer. 1960. Trilobites of the Upper Cambrian Dunderberg Shale, Eureka District, Nevada. United States Geological Survey Professional Paper 334-C:53-107 [P. Novack-Gottshall/P. Hearn/M. Hopkins] |