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
•"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)