D1437 CO: Blackhillsian, Nevada
collected by J. Ross, Jr. H. B. Barnes
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Trilobita
- Proetida
- Dimeropygidae
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Ischyrotoma sp.
Raymond 1925
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Trilobita
- Asaphida
- Asaphidae
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Ptyocephalus cf. vigilans
Whittington 1948
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Trilobita
- Ptychopariida
- Shumardiidae
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Shumardia exopthalmus
Ross and Barnes 1967
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| see common names | |||||||
Geography
| Country: | United States | State/province: | Nevada | County: | Nye |
| Coordinates: | 36.7° North, 116.2° West (view map) | ||||
| Paleocoordinates: | 5.8° South, 85.6° West | ||||
| Basis of coordinate: | estimated from map | ||||
| Geographic resolution: | small collection |
Time
| Period: | Ordovician | Epoch: | Early Ordovician |
| Stage: | Floian | 10 m.y. bin: | Ordovician 2 |
| Key time interval: | Blackhillsian | Trilobite zone: | J? |
| Age range of interval: | 473.9 - 470 m.y. ago |
Stratigraphy
| Formation: | Ninemile | ||||
| Local section: | Specter Range | Local bed: | 5 above base Barnes' Unit 9 ft | ||
| Local order: | bottom to top | ||||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: Ibexian. Was Antelope Valley Ls Barnes Unit 9 | |||||
Lithology and environment
| Primary lithology: | lithified "limestone" | ||
| Lithology description: nodular; silty; irregularly laminated, thin to very thin-bedded, medium to coarse-grained | |||
| Environment: | shallow subtidal indet. | Tectonic setting: | passive margin |
| Geology comments: carbonate platform | |||
Taphonomy
| Modes of preservation: | body,replaced with silica |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection methods: | bulk,field collection |
| Reason for describing collection: | biostratigraphic analysis |
| Collectors: | J. Ross, Jr. H. B. Barnes |
Metadata
| Also known as: | SF 8 | ||
| Database number: | 104630 | ||
| Authorizer: | S. Finnegan | Enterer: | S. Finnegan |
| Modifier: | P. Wagner | Research group: | marine invertebrate |
| Created: | 2011-02-07 12:04:21 | Last modified: | 2018-04-29 18:53:07 |
| Access level: | the public | Released: | 2011-02-07 12:04:21 |
| Creative Commons license: | CC BY | ||
Reference information
Primary reference:
| 25413. | R. J., J.r. Ross and H. B. Barnes. 1967. Some Middle Ordovician Brachiopods and Trilobites from the Basin Ranges, Western United States. United States Geological Survey Professional Paper 523-D:D1-D4 [S. Finnegan/S. Finnegan/P. Wagner] |