USGS M141, Fossil Hill: Illyrian, Nevada
collected by N.J. Silberling 1956-1965
|
Cephalopoda
- Ammonoida
- Ceratitidae
|
|
|
|
|
4 specimens |
|
|
|
|
|
19 specimens |
|
|
Cephalopoda
- Ammonoida
- Longobarditidae
|
|
|
|
|
9 specimens |
|
|
Cephalopoda
- Ammonoida
- Proteusitidae
|
|
|
|
|
1 specimen |
|
| see common names |
| Country: | United States |
State/province: | Nevada |
County: | Pershing |
| Coordinates: |
40.3° North, 118.1° West (view map) |
| Paleocoordinates: | 25.0° North, 38.3° West (Wright 2013) |
| Basis of coordinate: | estimated from map |
| Altitude: | 5000 feet |
| Geographic resolution: | small collection |
| Period: | Triassic |
Epoch: | Middle Triassic |
| Stage: | Anisian |
10 m.y. bin: | Triassic 2 |
| Key time interval: | Illyrian |
Ammonoid zone: | rotelliformis |
| Age range of interval: | 243.8 - 242 m.y. ago |
| Geological group: | Star Peak |
Formation: | Prida |
Member: | Fossil Hill |
| Stratigraphic resolution: | bed |
| Stratigraphy comments: Gymnotoceras blakei beds |
| Primary lithology: | lenticular,gray lithified "limestone" |
| Secondary lithology: | lithified calcareous "siliciclastic" |
| Includes fossils? | Y |
| Lithology description: (p. 3) the Fossil Hill Member, which is dark-gray, commonly fossiliferous, lenticular limestone interbedded with calcareous mudstone, siltstone, and shale. |
| Environment: | basinal (carbonate) |
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
| Articulated whole bodies: | some |
| Associated major elements: | some |
| Collection methods: | surface (in situ),field collection |
| Reason for describing collection: | taxonomic analysis |
| Museum repositories: | USNM |
| Collectors: | N.J. Silberling |
Collection dates: | 1956-1965 |
| Database number: | 38924 |
| Authorizer: | A. McGowan |
Enterer: | A. McGowan |
| Modifier: | M. Clapham |
Research group: | marine invertebrate |
| Created: | 2004-05-17 10:18:28 |
Last modified: | 2025-02-22 15:12:02 |
| Access level: | the public |
Released: | 2004-05-17 10:18:28 |
| Creative Commons license: | CC0 |
| 10526. | | N. J. Silberling and K. M. Nichols. 1982. Middle Triassic Molluscan Fossils of Biostratigraphic Significance from the Humboldt Range, Northwestern Nevada. Geological Survey Professional Paper 1207 [A. McGowan/A. McGowan/A. McGowan] |