Where: San Pete County, Utah (39.1° N, 111.7° W: paleocoordinates 32.9° N, 54.6° W)

• coordinate estimated from map

When: Twelvemile Canyon Member (Arapien Shale Formation), Late/Upper Bathonian to Late/Upper Bathonian (167.7 - 161.2 Ma)

• From upper part of member, about 1,800(?) ft below base of Twist Gulch Member.

Environment/lithology: marine; calcareous shale and siltstone

Size class: macrofossils

Collected by R. W. Imlay, John Mclntyre, and C. T. Hardy in 1949; reposited in the USNM

Primary reference: R. W. Imlay. 1964. Marine Jurassic Pelecypods From Central and Southern Utah. United States Geological Survey Professional Paper 483-C:C1-C42 [S. Holland/P. Monarrez]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 169148: authorized by Steven Holland, entered by Pedro Monarrez on 08.05.2015

Creative Commons license: CC BY (attribution)