Where: Alaska (62.1° N, 147.7° W: paleocoordinates 30.5° N, 81.8° W)

• coordinate stated in text

• small collection-level geographic resolution

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

• upper part of Tuxedni formation 400-800 ft below base of Chinitna formation;

•Cranocephalites beds, 'the beds could be either Bathonian or earliest Callovian or both... 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 siliciclastic sediments

Size class: macrofossils

Reposited in the USGS

• collection was made by A. Grantz, R. W. Imlay and others in 1952

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 68759: authorized by Martin Aberhan, entered by Sabine Nürnberg on 06.02.2007

Creative Commons license: CC BY (attribution)