Where: Alaska (69.6° N, 146.3° W: paleocoordinates 69.2° N, 49.1° W)

• small collection-level geographic resolution

When: Kingak Shale Formation, Early/Lower Bajocian (171.6 - 168.4 Ma)

• 1000-1500 ft. below top of the Kingak Shale.

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified ironstone and shale

Reposited in the USGS

Primary reference: R. W. Imlay. 1955. Characteristic Jurassic Mollusks from northern Alaska. United States Geological Survey Professional Paper 274-D:69-96 [J. Alroy/M. Sommers]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 5472: authorized by John Alroy, entered by Mike Sommers on 04.10.1999

Creative Commons license: CC BY (attribution)