USGS Mesozoic loc. 19951: Bajocian, Alaska
collected by H. Wedow and L.B. Kellum 1944
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Bivalvia
- Trigoniida
- Myophorellidae
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Myophorella argo
Crickmay 1930
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| see common names | |||||||
Geography
| Country: | United States | State/province: | Alaska |
| Coordinates: | 59.8° North, 153.2° West (view map) | ||
| Paleocoordinates: | 28.8° North, 84.9° West | ||
| Basis of coordinate: | estimated from map |
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
| Geological group: | Tuxedni | Formation: | Red Glacier | ||
| Stratigraphy comments: 19951 - Middle Bajocian, 15 m (50 ft) below top of Red Glacier Formation (Detterman and Hartsock, 1966; Imlay, 1964) | |||||
Lithology and environment
| Primary lithology: | concretionary lithified silty "limestone" |
| Secondary lithology: | coarse,gray,red or brown lithified sandy "shale" |
| Includes fossils? | Y |
| Lithology description: From Detterman and Hartsock, 1966: "Siltstone, thin-bedded, coarse-grained, brownishgray; thin interbeds of very fine grained sandstone; large limestone concretions in upper part; porphyritic andesite sill near middle of unit; many thin coquina beds containing Witchellia, Parabigotites, Holcophylloceras, and the pelecypods Meleagrinella, Trigonia, and Inoceramus" From Imlay, 1964: "Silty limestone with partings pf sandy shale" | |
| Environment: | marine indet. |
Taphonomy
| Modes of preservation: | body,coquina |
| Size of fossils: | macrofossils,mesofossils |
Collection methods and comments
| Collection methods: | field collection,survey of museum collection | ||
| Reason for describing collection: | taxonomic analysis | ||
| Museum repositories: | USNM | ||
| Collectors: | H. Wedow and L.B. Kellum | Collection dates: | 1944 |
Metadata
| Database number: | 139545 | ||
| Authorizer: | G. Stanley | Enterer: | H. Shepherd |
| Modifier: | H. Shepherd | ||
| Created: | 2013-02-13 11:35:47 | Last modified: | 2013-02-12 18:45:47 |
| Access level: | the public | Released: | 2013-02-13 11:35:47 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 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] |