USGS Mesozoic loc. 19601, Sun River area, Western Montana: Bathonian, Montana
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Bivalvia
- Pectinida
- Oxytomidae
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Meleagrinella curta
(Hall 1852)
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Bivalvia
- Pectinida
- Pectinidae
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Camptonectes sp.
Meek 1864
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Cephalopoda
- Ammonitida
- Perisphinctidae
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Cobbanites sp.
Imlay 1962
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Cephalopoda
- Ammonitida
- Cardioceratidae
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Arctocephalites (Cranocephalites) cf. gracilis
(Spath 1932)
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Arctocephalites (Cranocephalites) sawtoothensis
(Imlay 1948)
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Arctocephalites (Cranocephalites) cf. platynotus
(Spath 1932)
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| A. (C.) cf. A.? platynotus | ||||||||||
| see common names | ||||||||||
Geography
| Country: | United States | State/province: | Montana |
| Coordinates: | 47.9° North, 112.8° West (view map) | ||
| Paleocoordinates: | 40.6° North, 52.1° West | ||
| Basis of coordinate: | estimated from map | ||
| Geographic resolution: | small collection |
Time
| Period: | Jurassic | Epoch: | Middle Jurassic |
| Stage: | Bathonian | 10 m.y. bin: | Jurassic 4 |
| Key time interval: | Bathonian | ||
| Age range of interval: | 168.20000 - 165.30000 m.y. ago |
Stratigraphy
| Formation: | Sawtooth | Member: | Upper Siltstone | ||
| Stratigraphic resolution: | group of beds | ||||
| Stratigraphy comments: upper 2 ft of upper member of Sawtooth formation; the Upper Siltstone member is probably of Bathonian age | |||||
Lithology and environment
| Primary lithology: | lithified siltstone |
| Lithology description: The upper siltstone member consists of yellow calcareous siltstone and fine-grained sandstone. | |
| Environment: | marine indet. |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection methods: | field collection |
| Reason for describing collection: | biostratigraphic analysis |
| Museum repositories: | USGS |
| Collection method comments: collection was made by R. W. Imlay in 1945 | |
Metadata
| Database number: | 68844 | ||
| Authorizer: | M. Aberhan | Enterer: | S. Nurnberg |
| Modifier: | S. Nurnberg | Research group: | marine invertebrate |
| Created: | 2007-02-10 04:16:43 | Last modified: | 2007-02-15 03:29:11 |
| Access level: | the public | Released: | 2007-02-10 04:16:43 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 19843. | 1% | R. W. Imlay. 1962. Jurassic (Bathonian or Early Callovian) Ammonites from Alaska and Montana. Geological Survey Professional Paper 374-C:1-32 [M. Aberhan/S. Nurnberg] |