USGS Mesozoic loc. 27037, Sun River area, Western Montana: Bajocian, Montana
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Echinoidea
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Echinoidea indet.
(Leske 1778)
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Echinoid spines | ||||||||||
Bivalvia
- Ostreida
- Ostreidae
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Ostrea sp.
Linnaeus 1758
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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
- Pholadida
- Pleuromyidae
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Pleuromya cf. oblongata
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original and current combination Myacites (Pleuromya) | ||||||||||
Bivalvia
- Trigoniida
- Trigoniidae
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Trigonia cf. conradi
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see common names |
Geography
Country: | United States | State/province: | Montana |
Coordinates: | 47.6° North, 112.7° West (view map) | ||
Paleocoordinates: | 39.7° North, 51.4° West | ||
Basis of coordinate: | stated in text | ||
Geographic resolution: | small collection |
Time
Period: | Jurassic | Epoch: | Middle Jurassic |
Stage: | Bajocian | 10 m.y. bin: | Jurassic 4 |
Key time interval: | Bajocian | ||
Age range of interval: | 170.90000 - 168.20000 m.y. ago |
Stratigraphy
Formation: | Sawtooth | Member: | Lower Sandstone | ||
Stratigraphic resolution: | group of beds | ||||
Stratigraphy comments: from lower sandstone member of Sawtooth formation; the Lower Sandstone member is probably of Bajocian age |
Lithology and environment
Primary lithology: | lithified sandstone |
Lithology description: The lower member of the Sawtooth formation consists of siliceous sandstone and sandy limestone. | |
Environment: | marine indet. |
Taphonomy
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 1958 |
Metadata
Database number: | 68828 | ||
Authorizer: | M. Aberhan | Enterer: | S. Nurnberg |
Modifier: | S. Nurnberg | Research group: | marine invertebrate |
Created: | 2007-02-09 09:31:01 | Last modified: | 2007-02-10 09:48:49 |
Access level: | the public | Released: | 2007-02-09 09:31:01 |
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] |