Where: Alaska (69.6° N, 144.7° W: paleocoordinates 68.7° N, 49.7° W)

• small collection-level geographic resolution

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

• About 3000 ft above base of Jurassic.

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified, concretionary, pyritic, black 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 5490: authorized by John Alroy, entered by Mike Sommers on 04.10.1999

Creative Commons license: CC BY (attribution)