USGS Mesozoic loc. 18324, Sun River area, Western Montana: Bathonian, Montana
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Cephalopoda
- Ammonitida
- Cardioceratidae
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? Arctocephalites saypoensis
Imlay 1962
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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 stygius
White 1874
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Bivalvia
- Ostreida
- Ostreidae
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Ostrea sp.
Linnaeus 1758
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Bivalvia
- Mytilida
- Mytilidae
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Modiolus rosii
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Bivalvia
- Cardiida
- Anthracosiidae
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Pleuromya subcompressa
(Meek 1873)
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Bivalvia
- Cardiida
- Cardiidae
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Protocardia schucherti
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Bivalvia
- Carditida
- Astartidae
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Astarte cf. packardi
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| see common names | |||||||
Geography
| Country: | United States | State/province: | Montana |
| Coordinates: | 47.5° North, 112.7° West (view map) | ||
| Paleocoordinates: | 40.2° North, 52.2° West | ||
| Basis of coordinate: | stated in text | ||
| 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: | 168.2 - 165.3 m.y. ago |
Stratigraphy
| Formation: | Sawtooth | Member: | Upper Siltstone | ||
| Stratigraphic resolution: | group of beds | ||||
| Stratigraphy comments: from 10 ft of sandy shale and limestone near base of measured section, upper member of Sawtooth formation; the Upper Siltstone member is probably of Bathonian age | |||||
Lithology and environment
| Primary lithology: | lithified sandy "shale" |
| Secondary lithology: | lithified "limestone" |
| Environment: | marine indet. |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection methods: | survey of museum collection |
| Reason for describing collection: | biostratigraphic analysis |
| Museum repositories: | USGS |
| Collection method comments: collection was made by C. F. Deiss in 1940 | |
Metadata
| Database number: | 68869 | ||
| Authorizer: | M. Aberhan | Enterer: | S. Nurnberg |
| Modifier: | S. Nurnberg | Research group: | marine invertebrate |
| Created: | 2007-02-10 08:55:40 | Last modified: | 2007-02-15 03:40:10 |
| Access level: | the public | Released: | 2007-02-10 08:55:40 |
| 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] |