Pierre Shale (USGS D1967): Campanian, Wyoming
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
|
Bivalvia
- Pectinida
- Oxytomidae
|
|||||||
|
Oxytoma nebrascana
(Evans and Shumard 1857)
|
|||||||
|
Bivalvia
- Ostreida
- Pteriidae
|
|||||||
|
Pteria sp.
Scopoli 1777
|
|||||||
|
Bivalvia
- Nuculida
- Nuculidae
|
|||||||
|
Nucula sp.
Lamarck 1799
|
|||||||
|
Gastropoda
- Naticidae
|
|||||||
|
Euspira obliquata
|
|||||||
|
Cephalopoda
- Ammonitida
- Baculitidae
|
|||||||
|
Baculites eliasi
Cobban 1958
|
|||||||
|
Cephalopoda
- Ammonitida
- Scaphitidae
|
|||||||
|
Acanthoscaphites sp.
Nowak 1911
|
|||||||
|
Hoploscaphites sp.
Nowak 1911
|
|||||||
| see common names | |||||||
Geography
| Country: | United States | State/province: | Wyoming | County: | Niobrara |
| Coordinates: | 43.3° North, 104.3° West (view map) | ||||
| Paleocoordinates: | 49.2° North, 71.7° West | ||||
| Basis of coordinate: | estimated from map | ||||
| Geographic resolution: | small collection |
Time
| Period: | Cretaceous | Epoch: | Late/Upper Cretaceous |
| Stage: | Campanian | 10 m.y. bin: | Cretaceous 7 | *Epoch: | Senonian |
| Key time interval: | Campanian | Ammonoid zone: | Baculites eliasi |
| Age range of interval: | 83.60000 - 72.10000 m.y. ago | ||
| * legacy (obsolete) database fields | |||
Stratigraphy
| Geological group: | Montana | Formation: | Lewis Shale | Member: | Kara Bentonitic |
| Stratigraphic resolution: | bed |
Lithology and environment
| Primary lithology: | brown lithified "limestone" | ||
| Lithology description: "ls, weathers moderate brown, forms persistent ridge" | |||
| Environment: | offshore | Tectonic setting: | cratonic basin |
| Geology comments: "ls, weathers moderate brown, forms persistent ridge" | |||
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection methods: | mechanical,field collection |
| Reason for describing collection: | biostratigraphic analysis |
| Museum repositories: | USGS |
| Taxonomic list comments:"The fossils are ordinarily well-preserved. Most of the cephalopod shells and the inner nacreous layer of Inoceramus are aragonitic, especially specimens from above the Red Bird Silty Member. Shell material and specimens from the Red Bird member and the upper 50' of the underlying Mitten Member is partially transformed to calcite...Ammonites...of the [mid-upper third] of the Mitten Member are...entirely aragonite whereas shell material [of underlying material] is completely transformed to calcite." | |
Metadata
| Database number: | 1619 | ||
| Authorizer: | J. Alroy, P. Wagner | Enterer: | M. Sommers, P. Wagner |
| Modifier: | P. Wagner | Research group: | marine invertebrate |
| Created: | 1999-05-19 14:55:07 | Last modified: | 2024-03-15 18:24:56 |
| Access level: | the public | Released: | 1999-05-19 14:55:07 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 45. | J. R. Gill, W. A. Cobban, and P. M. Kier. 1966. The Red Bird Section of the Upper Cretaceous Pierre Shale in Wyoming. United States Geological Survey Professional Paper 393-A:1-73 [J. Alroy/M. Sommers/A. Clement] |