USGS M136 -5 ft, Fossil Hill: Illyrian, Nevada
collected by N.J. Silberling 1956-1965
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
|
Cephalopoda
- Ceratitida
- Ceratitidae
|
|||||||
|
Gymnotoceras rotelliformis
(Meek 1877)
|
12 specimens | ||||||
|
Paraceratites vogdesi
(Smith 1904)
|
4 specimens | ||||||
| see common names | |||||||
Geography
| Country: | United States | State/province: | Nevada | County: | Pershing |
| Coordinates: | 40.3° North, 118.1° West (view map) | ||||
| Paleocoordinates: | 11.2° North, 42.3° West | ||||
| Basis of coordinate: | estimated from map | ||||
| Geographic resolution: | small collection |
Time
| 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 |
Stratigraphy
| Geological group: | Star Peak | Formation: | Prida | Member: | Fossil Hill |
| Local section: | Fossil Hill M136 | Local bed: | 1.5 m | ||
| Local order: | top to bottom | ||||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: Paraceratites vogdesi beds | |||||
Lithology and environment
| 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) |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection methods: | surface (in situ),field collection | ||
| Collection size: | 168 individuals | ||
| Reason for describing collection: | taxonomic analysis | ||
| Museum repositories: | USNM | ||
| Collectors: | N.J. Silberling | Collection dates: | 1956-1965 |
Metadata
| Also known as: | 57-66-1 | ||
| Database number: | 142856 | ||
| Authorizer: | M. Clapham | Enterer: | M. Clapham |
| Modifier: | M. Clapham | Research group: | marine invertebrate |
| Created: | 2013-04-17 12:30:02 | Last modified: | 2013-04-16 21:36:43 |
| Access level: | the public | Released: | 2013-04-17 12:30:02 |
| Creative Commons license: | CC BY | ||
Reference information
Primary reference:
| 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] |