USGS Mesozoic loc. 20008: Bajocian, Alaska
collected by H. Wedow and L.B. Kellum 1944

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Bivalvia - Trigoniida - Myophorellidae
Myophorella dawsoni Whiteaves 1878
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:Gaikema
Stratigraphy comments: Bajocian, base of Gaiema Sandstone (Detterman and Hartsock, 1966)
Lithology and environment
Primary lithology:massive,coarse,gray,yellow conglomeratic sandstone
Secondary lithology: siltstone
Lithology description: Sandstone, massive, locally conglomeratic; minor siltstone "Sandstone medium bedded to massive medium to coarse grained olive gray to dusky yellow green weathers dark brown lenticular beds of pebble cobble conglomerate silty shale and siltstone in lower part of unit one thin bed of chocolate brown friable sandstone near base of unit many coquina beds Witchellia Trigonia and Inoceramus." (Detterman and Hartsock, 1966) "The Gaikema Sandstone Member, named by Kirschner and Minard (1948) after Gaikema Creek on Iniskin Peninsula, is herein designated the Gaikema Sandstone. The type locality is designated as the left bank of the creek, starting 5,000 feet frO'm the mouth and continuing for 1,800 feet upstream. The section at the type locality is 850 feet thick and consists of resistant cliff forming sandstone, in part conglomeratic. Siltstone, shale, and cobble-boulder conglomerate are subordinate constituents." (Detterman, 1963)
Environment:marine indet.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils,mesofossils
Collection methods and comments
Reason for describing collection:taxonomic analysis
Museum repositories:USNM
Collectors:H. Wedow and L.B. Kellum Collection dates:1944
Metadata
Database number:139549
Authorizer:G. Stanley Enterer:H. Shepherd
Created:2013-02-13 12:13:16 Last modified:2013-02-12 19:13:16
Access level:the public Released:2013-02-13 12:13:16
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]