Bed 2479-CO, Duck Creek Range [Dunderberg Shale, Nopah Formation]: Dresbachian, Nevada
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Agnostida
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Glyptagnostus reticulatus
(Angelin 1851)
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| "angelini" | ||||||||||
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Trilobita
- Olenida
- Aphelaspidae
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Olenaspella separata
Palmer 1962
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Aphelaspis brachyphasis
Palmer 1962
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Lingulata
- Acrotretida
- Acrotretidae
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Opisthotreta sp.
Palmer 1954
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| see common names | ||||||||||
Geography
| Country: | United States | State/province: | Nevada |
| Coordinates: | 39.0° North, 115.0° West (view map) | ||
| Paleocoordinates: | 3.9° South, 88.4° 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: | Dresbachian | Trilobite zone: | Crepicephalus |
| Age range of interval: | 497 - 485.4 m.y. ago |
Stratigraphy
| Formation: | Nopah | Member: | Dunderberg Shale | ||
| Stratigraphic resolution: | formation | ||||
| Stratigraphy comments: Listed as Crepicephalus biozone | |||||
Lithology and environment
| Primary lithology: | lithified siltstone |
| Secondary lithology: | lenticular,planar lamination,fine,concretionary,gray lithified silty "limestone" |
| Lithology description: Siltstone with interbeds and lenses of gray, fine-grained, silty, generally laminated limestone, nodular limestone, and a few beds of crinkly 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: | 75742 | ||
| Authorizer: | P. Novack-Gottshall | Enterer: | P. Hearn |
| Modifier: | A. Hendy | Research group: | marine invertebrate |
| Created: | 2007-10-25 13:47:28 | Last modified: | 2009-06-12 20:35:32 |
| Access level: | the public | Released: | 2007-10-25 13:47:28 |
| 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] |