SD-1, Sourdough Creek [Snowy Range Fm]: Millardan, Montana
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Eocrinoidea
- Trachelocrinida
- Trachelocrinidae
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? Trachelocrinus sp.
Ulrich 1929
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| columnals and plates | ||||||||||
| see common names | ||||||||||
Geography
| Country: | United States | State/province: | Montana | County: | Gallatin |
| Coordinates: | 45.5° North, 110.9° West (view map) | ||||
| Paleocoordinates: | 32.2° North, 112.8° West (Wright 2013) | ||||
| Basis of coordinate: | based on nearby landmark |
Time
| Period: | Cambrian | Epoch: | Furongian |
| 10 m.y. bin: | Cambrian 5 | ||
| Key time interval: | Millardan | Trilobite zone: | Conaspis + Prosaukia |
| Age range of interval: | 497 - 486.85 m.y. ago |
Stratigraphy
| Formation: | Snowy Range | ||||
| Stratigraphic resolution: | formation | ||||
| Stratigraphy comments: Conaspis to Prosaukia zones. | |||||
Lithology and environment
| Primary lithology: | lithified argillaceous "limestone" |
| Includes fossils? | Y |
| Lithology description: thin-bedded LS associated with "pillar" stromatolites | |
| Environment: | marine indet. |
Taphonomy
| Modes of preservation: | body,original calcite |
| Size of fossils: | macrofossils,mesofossils |
Collection methods and comments
| Reason for describing collection: | taxonomic analysis |
| Museum repositories: | USNM |
Metadata
| Database number: | 90644 | ||
| Authorizer: | A. Lin | Enterer: | A. Lin |
| Modifier: | P. Wagner | Research group: | marine invertebrate |
| Created: | 2009-08-11 14:00:28 | Last modified: | 2025-02-22 15:12:02 |
| Access level: | the public | Released: | 2009-08-11 14:00:28 |
| Creative Commons license: | CC0 |
Reference information
Primary reference:
| 22459. | J. Sprinkle. 1973. Morphology and evolution of blastozoan echinoderms. Harvard University Museum of Comparative Zoology, Special Publication 1-283 [G. Webster/G. Webster/P. Wagner] |