Big Bend Quadrangle, Potem Formation, L.S.J.U. 2966: Bajocian, California
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Bivalvia
- Trigoniida
- Trigoniidae
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Trigonia undulata
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Bivalvia
- Trigoniida
- Myophorellidae
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Trigonia cf. vcostata
Lycett 1850
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| Trigonia cf. v-costata | ||||||||||
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= Vaugonia cf. kobayashii
Alencaster 1963
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Poulton 1979 | |||||||||
| see common names | ||||||||||
Geography
| Country: | United States | State/province: | California | County: | Shasta |
| Coordinates: | 41.3° North, 122.3° West (view map) | ||||
| Paleocoordinates: | 34.9° North, 61.6° West | ||||
| Basis of coordinate: | estimated from map | ||||
| 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: | Potem |
| Local section: | L.S.J.U. 2966 |
| Stratigraphic resolution: | group of beds |
Lithology and environment
| Primary lithology: | fine "siliciclastic" | ||
| Environment: | foreshore | Tectonic setting: | volcanic basin |
Taphonomy
| Modes of preservation: | body,mold/impression,original calcite |
| Size of fossils: | macrofossils |
| Preservation of anatomical detail: | poor |
| Fragmentation: | frequent |
Collection methods and comments
| Collection methods: | field collection |
| Reason for describing collection: | taxonomic analysis |
Metadata
| Database number: | 38341 | ||
| Authorizer: | M. Aberhan, J. Marcot | Enterer: | S. Nurnberg, J. Marcot |
| Modifier: | S. Nurnberg | Research group: | marine invertebrate |
| Created: | 2004-04-20 11:37:40 | Last modified: | 2004-04-20 14:49:41 |
| Access level: | the public | Released: | 2004-04-20 11:37:40 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 10279. | A. F. Sanborn. 1960. Geology and Paleontology of the southwest quarter of the Big Bend Quadrangle, Shasta County, California. California Division of Mines, Special Report 63 18-26 [M. Aberhan/S. Nurnberg/S. Nurnberg] |
Secondary references:
| 40842 | T. P. Poulton. 1979. Jurassic Trigoniid Bivalves from Canada and Western United States of America. Geological Survey of Canada Bulletin 282 [G. Stanley/H. Shepherd/H. Shepherd] |