USGS Mesozoic loc. 18714, Sun River area, Western Montana: Bathonian, Montana
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Gastropoda
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Gastropoda indet.
Cuvier 1795
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Bivalvia
- Arcida
- Parallelodontidae
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Grammatodon sp.
Meek and Hayden 1860
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Bivalvia
- Ostreida
- Gryphaeidae
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Ostrea strigilecula
White 1877
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| recombined as Liostrea strigilecula | ||||||||||
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Bivalvia
- Ostreida
- Pinnidae
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Pinna kingi
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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 platessiformis
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Camptonectes stygius
White 1874
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Bivalvia
- Cardiida
- Cardiidae
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Protocardia schucherti
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Bivalvia
- Cardiida
- Arcticidae
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cf. Isocyprina iddingsi
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| Isocyprina? cf. I.? iddingsi | ||||||||||
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Bivalvia
- Cardiida
- Anthracosiidae
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Pleuromya subcompressa
(Meek 1873)
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| original and current combination Myacites (Pleuromya) subcompressa | ||||||||||
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Bivalvia
- Pholadomyida
- Pholadomyidae
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Pholadomya kingi
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Bivalvia
- Carditida
- Astartidae
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Astarte meeki
Stanton 1899
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Bivalvia
- Trigoniida
- Trigoniidae
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Trigonia montanaensis
Meek 1873
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Cephalopoda
- Ammonitida
- Sphaeroceratidae
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? Xenocephalites sp.
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| see common names | ||||||||||
Geography
| Country: | United States | State/province: | Montana |
| Coordinates: | 47.8° North, 112.7° West (view map) | ||
| Paleocoordinates: | 40.5° 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: zone 4 from basal 13 ft of upper member of Sawtooth formation, or 107-120 ft above base of Ellis Group; 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: | survey of museum collection |
| Reason for describing collection: | biostratigraphic analysis |
| Museum repositories: | USGS |
| Collection method comments: collection was made by C. F. Deiss in 1941 | |
Metadata
| Database number: | 68848 | ||
| Authorizer: | M. Aberhan | Enterer: | S. Nurnberg |
| Modifier: | S. Nurnberg | Research group: | marine invertebrate |
| Created: | 2007-02-10 04:51:39 | Last modified: | 2007-02-15 03:30:43 |
| Access level: | the public | Released: | 2007-02-10 04:51:39 |
| 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] |