Bed 2535-CO, Nopah Formation: Steptoean, Nevada
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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unclassified
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Acmarhachis acutus
Kobayashi 1938
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Aphelaspinid indet.
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Lingulata
- Acrotretida
- Acrotretidae
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Angulotreta sp.
Palmer 1954
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Trilobita
- Corynexochida
- Cheilocephalidae
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Cheilocephalus sp.
Berkey 1898
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= Cheilocephalus granulosus
Palmer 1965
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Palmer 1965 | |||||||||
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Trilobita
- Olenida
- Aphelaspidae
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Aphelaspis subditus
Palmer 1962
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Olenaspella regularis
Palmer 1962
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Palmer 1965 | |||||||||
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Dicanthopyge quadrata
Palmer 1965
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Palmer 1965 | |||||||||
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Listroa toxoura
Palmer 1962
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Agnostida
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Glyptagnostus reticulatus
(Angelin 1851)
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Agnostida
- Agnostidae
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Agnostus inexpectans
Kobayashi 1938
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Agnostida
- Clavagnostidae
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Aspidagnostus rugosus
Palmer 1962
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| Originally Apsidagnostus; assumed spelling error | ||||||||||
| see common names | ||||||||||
Geography
| Country: | United States | State/province: | Nevada |
| Coordinates: | 40.0° North, 115.0° West (view map) | ||
| Paleocoordinates: | 3.9° South, 87.4° West | ||
| 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 | ||
| Age range of interval: | 497 - 493 m.y. ago |
Stratigraphy
| Formation: | Nopah | Member: | Dunderberg Shale | ||
| Stratigraphic resolution: | formation | ||||
| Stratigraphy comments: Listed as Aphelaspis biozone | |||||
Lithology and environment
| Primary lithology: | lithified siltstone |
| Secondary lithology: | lenticular,planar lamination,fine,gray lithified silty "limestone" |
| Lithology description: Siltstone with interbeds and lenses of gray, fine-grained, silty, generally laminated limestone | |
| Environment: | deep subtidal shelf |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils,mesofossils |
| Spatial orientation: | life position |
| Articulated whole bodies: | some |
| Size sorting: | poor |
| Fragmentation: | occasional |
| Spatial resolution: | autochthonous |
Collection methods and comments
| Reason for describing collection: | biostratigraphic analysis |
| Collection method comments: Sample chosen at random | |
Metadata
| Database number: | 75738 | ||
| Authorizer: | P. Novack-Gottshall, M. Hopkins | Enterer: | P. Hearn, M. Hopkins |
| Modifier: | P. Novack-Gottshall | Research group: | marine invertebrate |
| Created: | 2007-10-25 13:29:43 | Last modified: | 2008-06-14 12:38:24 |
| Access level: | the public | Released: | 2007-10-25 13:29:43 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 25553. | A.R. Palmer. 1962. Glyptagnostus and associated trilobites in the United States. United States Geological Survey Professional Paper 374(F):F1-F49 [P. Novack-Gottshall/P. Hearn/P. Wagner] |
Secondary references:
| 36349 | A. R. Palmer. 1965. Trilobites of the Late Cambrian Pterocephaliid Biomere in the Great Basin, United States. United States Geological Survey Professional Paper 493:1-105 [M. Hopkins/M. Hopkins] |