USGS Mesozoic loc. 20728: Early/Lower Callovian, Alaska
collected by C.E. Kirschner 1946

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Bivalvia - Trigoniida - Myophorellidae
Vaugonia doroschini (Eichwald 1871)
original and current combination Trigonia doroschini
see common names

Geography
Country:United States State/province:Alaska
Coordinates: 59.7° North, 153.4° West (view map)
Paleocoordinates:32.9° North, 87.8° West
Basis of coordinate:estimated from map
Time
Period:Jurassic Epoch:Middle Jurassic
Stage:Callovian 10 m.y. bin:Jurassic 5
Key time interval:Early/Lower Callovian
Age range of interval:165.30000 - 161.50000 m.y. ago
Stratigraphy
Geological group:Tuxedni Formation:Bowser
Stratigraphy comments: Probably Lower Callovian, near top of Bowser Formation (loc. 177 of Detterman and Hartsock, 1966)
Lithology and environment
Primary lithology:massive,gray sandstone
Secondary lithology:pebbly conglomerate
Includes fossils?Y
Lithology description: "massive units of cliff forming graywacke-type sandstone and pebble-cobble conglomerate, thin-bedded, poorly consolidated shale, and massive siltstone." "An important feature of the Bowser are the numerous coquina beds in the calcareous light-gray sandstone. Ihe beds are 1-3 feet thick and are similar to the ones in the Gaikema and Red Glacier Formations. These beds appear to be confined to the coarser clastic parts of the formation on Iniskin Peninsula; they were not seen north of Chinitna Bay, where the beds contain abundant ammonite-bearing concretions. The coquina beds are composed almost entirely of the pelecypods Inoceramus and Trigonia."
Environment:marine indet.
Taphonomy
Modes of preservation:body,coquina
Size of fossils:macrofossils,mesofossils
Collection methods and comments
Collection methods:survey of museum collection
Reason for describing collection:taxonomic analysis
Museum repositories:USNM
Collectors:C.E. Kirschner Collection dates:1946
Metadata
Database number:139554
Authorizer:G. Stanley Enterer:H. Shepherd
Created:2013-02-13 12:57:10 Last modified:2013-02-12 19:57:10
Access level:the public Released:2013-02-13 12:57:10
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]