Fremont Formation Cephalopods: Maysvillian - Richmondian, Colorado
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Cephalopoda
- Actinocerida
- Gonioceratidae
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Lambeoceras sp.
Foerste 1917
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Cephalopoda
- Actinocerida
- Actinoceratidae
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Actinoceras sp.
Bronn 1837
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Cephalopoda
- Orthocerida
- Proteoceratidae
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Ephippiorthoceras sp.
Foerste 1924
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Cephalopoda
- Orthocerida
- Kionoceratidae
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Kionoceras sp.
Hyatt 1884
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Cephalopoda
- Orthocerida
- Tripteroceratidae
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Allumettoceras sp.
Foerste 1926
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Cephalopoda
- Endocerida
- Endoceratidae
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Cyclendoceras cylindricum
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Endoceras sp.
Hall 1847
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Cephalopoda
- Pseudorthocerida
- Spyroceratidae
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Spyroceras sp.
Hyatt 1884
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Cephalopoda
- Ascocerida
- Probillingsitidae
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Probillingsites kessleri
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Cephalopoda
- Oncocerida
- Oncoceratidae
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Beloitoceras accultum
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| see common names | |||||||
Geography
| Country: | United States | State/province: | Colorado |
| Coordinates: | 38.0° North, 105.0° West (view map) | ||
| Paleocoordinates: | 15.0° South, 71.2° West | ||
| Geographic resolution: | local area |
Time
| Period: | Ordovician | Epoch: | Late/Upper Ordovician |
| Stage: | Katian | 10 m.y. bin: | Ordovician 5 |
| *Period: | Late/Upper Ordovician | *Epoch: | Ashgill | *Local age/stage: | Maysvillian - Richmondian |
| Key time interval: | Maysvillian - Richmondian | ||
| Age range of interval: | 450.40000 - 446.00000 m.y. ago | ||
| * legacy (obsolete) database fields | |||
Stratigraphy
| Formation: | Fremont | ||||
| Stratigraphic resolution: | member | ||||
| Stratigraphy comments: Stratigraphy from "Harding and Fremont Formations, Colorado," Sweet 1954. | |||||
Lithology and environment
| Primary lithology: | red argillaceous,cherty/siliceous dolomite | ||
| Includes fossils? | Y | ||
| Lithology description: Massive dolomite member: massive, cherty, buff or gray. Priest Canyon member: thin-bedded, argillaceous, fine-grained dolomite. | |||
| Environment: | deep subtidal indet. | Tectonic setting: | cratonic basin |
| Geology comments: Stratigraphy from "Harding and Fremont Formations, Colorado," Sweet 1954, environments from S. Holland. Fossils replaced with dolomite. | |||
Taphonomy
Collection methods and comments
| Collection excludes: | all microfossils,some macrofossils |
| Collection methods: | field collection |
| Reason for describing collection: | biostratigraphic analysis |
Metadata
| Database number: | 10390 | ||
| Authorizer: | S. Holland | Enterer: | T. Hanson |
| Modifier: | S. Holland | Research group: | marine invertebrate |
| Created: | 2001-04-12 12:04:00 | Last modified: | 2003-07-09 09:53:54 |
| Access level: | the public | Released: | 2001-04-12 12:04:00 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 3834. | W. C. Sweet. 1955. Cephalopods from the Fremont Formation of Central Colorado. Journal of Paleontology 29(1):71-82 [S. Holland/T. Hanson] |