USGS Mesozoic loc. 2919, 20764 (Jurassic to of the United States)

Also known as USGS 3035, 3038, 3034

Where: Alaska (59.7° N, 153.4° W: paleocoordinates 30.8° N, 86.5° W)

• coordinate based on nearby landmark

When: Bowser Formation, Bathonian to Bathonian (168.3 - 163.5 Ma)

• From Poulton, 1979

•2919 & 3034 - Probably Bathonian

•20764 - Bathonian (Imlay, pers. com., 1977)

•3035 - Bathonian or Callovian

•3038 - Callovian, Bowser Formation according to Imlay (1926); revised to Bathonian (Imlay, pers. com., 1977); zone A of section of Martin (1926, p. 145)

Environment/lithology: marine; shale and sandstone

• From Martin, 1926:

•"Zone B" : Shale with several fossil bands containing Trigonia doroschini, etc 50 ft. Concealed.

•"Zone A": Shale with several fossil beds each 10 to 25 inches thick and packed with fossils; Trigonia doroschini, T. devexa, etc, 30 ft. Concealed.

•From Detterman and Hartsock, 1966: "The heterogenous assemblage of rocks assigned to the Bowser Formation includes massive units of cliffforming graywacke-type sandstone and pebble-cobble conglomerate, thin-bedded, poorly consolidated shale, and massive siltstone. The character is further confused by rapid facies changes."

Size classes: macrofossils, mesofossils, microfossils

Collected by G.C. Martin; T.W. Stanton, L. Martin; C.E. Kirschner in 1903; 1904; 1946; reposited in the USGS, USNM

Primary reference: 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]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 139465: authorized by George Stanley, entered by Hannah Shepherd on 12.02.2013

Creative Commons license: CC BY (attribution)

Taxonomic list

Bivalvia
 Trigoniida - Myophorelloidae
Vaugonia doroschini Eichwald 1871 clam
Hypotype USNM 219919
Myophorella devexa Eichwald 1871 clam
Hypotype USNM 219886-219890
Myophorella orientalis Kobayashi and Tamura 1955 clam