USGS Mesozoic loc. 21295: Bajocian, Alaska
collected by R.W. Imlay 1948

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Bivalvia - Trigoniida - Myophorellidae
Myophorella tipperi Poulton 1979
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:based on nearby landmark
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: Middle Bajocian, 90 to 96 m (300-320 ft) below top of Red Glacier Formation
Lithology and environment
Primary lithology:coarse,brown,gray siltstone
Includes fossils?Y
Lithology description: 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
Environment:marine indet.
Taphonomy
Modes of preservation:body,coquina
Size of fossils:macrofossils,mesofossils,microfossils
Collection methods and comments
Collection methods:survey of museum collection
Reason for describing collection:taxonomic analysis
Museum repositories:USNM
Collectors:R.W. Imlay Collection dates:1948
Metadata
Database number:139587
Authorizer:G. Stanley Enterer:H. Shepherd
Modifier:H. Shepherd
Created:2013-02-14 08:13:32 Last modified:2013-02-13 15:28:00
Access level:the public Released:2013-02-14 08:13:32
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]