Where: Alaska (60.1° N, 152.7° W: paleocoordinates 30.2° N, 85.4° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Bowser Member (Tuxedni Formation), Bathonian (168.3 - 166.1 Ma)

• Middle part of Bowser member, Tuxedni formation;

•Cranocephalites beds, 'the beds could be of late Bathonian or very early Callovian age... the Arctocephalites (Cranocephalites) beds in Alaska or Montana are herein tentatively correlated with the Bathonian rather than the Callovian stage'

• group of beds-level stratigraphic resolution

Environment/lithology: marine; lithified, gray siltstone

Size class: macrofossils

Reposited in the USGS

• collection was made by R. W. Imlay in 1948

Primary reference: R. W. Imlay. 1962. Jurassic (Bathonian or Early Callovian) Ammonites from Alaska and Montana. Geological Survey Professional Paper 374-C:1-32 [M. Aberhan/S. Nurnberg]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 68770: authorized by Martin Aberhan, entered by Sabine Nürnberg on 06.02.2007

Creative Commons license: CC BY (attribution)