Lower Member, Shedhorn Formation of Montana: Wordian, Montana
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Lingulata
- Lingulida
- Discinidae
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Orbiculoidea sp.
d'Orbigny 1847
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| see common names | |||||||
Geography
| Country: | United States | State/province: | Montana |
| Coordinates: | 47.1° North, 109.4° West (view map) | ||
| Paleocoordinates: | 18.4° North, 28.4° West | ||
| Basis of coordinate: | based on political unit | ||
| Geographic resolution: | basin |
Time
| Period: | Permian | Epoch: | Guadalupian |
| Stage: | Wordian | 10 m.y. bin: | Permian 4 |
| Key time interval: | Wordian | ||
| Age range of interval: | 266.9 - 264.28 m.y. ago |
Lithology and environment
| Primary lithology: | sandstone |
| Includes fossils? | Y |
| Environment: | marine indet. |
Taphonomy
Collection methods and comments
| Reason for describing collection: | biostratigraphic analysis |
Metadata
| Database number: | 11277 | ||
| Authorizer: | A. Miller | Enterer: | C. Ferguson |
| Modifier: | C. Ferguson | Research group: | marine invertebrate |
| Created: | 2001-07-30 11:23:44 | Last modified: | 2006-07-13 15:31:24 |
| Access level: | the public | Released: | 2001-07-30 11:23:44 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 4145. | 1% 17920 | E. L. Yochelson and D. H. Van Sickle. 1968. Biostratigraphy of the Phosphoria, Park City, and Shedhorn Formations; Geology of Permian Rocks in the Western Phosphate Field. United States Geological Survey Professional Paper 313(D):572-660 [A. Miller/C. Ferguson/P. Wagner] |