USGS Mesozoic loc. 2999: Bajocian, Alaska
collected by T.W. Stanton, G.C. Martin, A. Brown 1904
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Bivalvia
- Trigoniida
- Myophorellidae
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Myophorella aff. dawsoni
Whiteaves 1878
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see common names |
Geography
Country: | United States | State/province: | Alaska |
Coordinates: | 60.2° North, 152.7° West (view map) | ||
Paleocoordinates: | 28.9° North, 84.4° 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: | 170.30000 - 168.30000 m.y. ago |
Stratigraphy
Formation: | Fitz Creek Siltstone | ||||
Stratigraphy comments: Middle Bajocian |
Lithology and environment
Primary lithology: | silty,conglomeratic sandstone |
Secondary lithology: | "limestone" |
Includes fossils? | Y |
Includes fossils? | Y |
Lithology description: Talus, probably mostly from beds 11 to 14 of Martin (1926, p. 142; see also Imlay, 1964, p. B23, loc. 22) From Martin, 1926: 11. Dark limestone with abundant fossils, Sphaeroceras cepoides, Pleuromya, etc. (lots 2997 and 10516) 2-4 ft 12. Dark shale 3 ft 13. Dark conglomerate rock (arkose) 7 ft 14. Dark shale with conglomerate bands and with fossils (lot 2998) 26 ft From Imlay, 1964: Fitz Creek Siltstone. From silty sandstone 150 ft below top. Same as unit 19 of section by Stanton and Martin. | |
Environment: | marine indet. |
Taphonomy
Modes of preservation: | body,cast,mold/impression |
Size of fossils: | macrofossils,mesofossils,microfossils |
Collection methods and comments
Reason for describing collection: | taxonomic analysis | ||
Collectors: | T.W. Stanton, G.C. Martin, A. Brown | Collection dates: | 1904 |
Metadata
Database number: | 139472 | ||
Authorizer: | G. Stanley | Enterer: | H. Shepherd |
Created: | 2013-02-12 07:11:42 | Last modified: | 2013-02-11 14:11:42 |
Access level: | the public | Released: | 2013-02-12 07:11:41 |
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] |