Where: Montana (48.2° N, 106.1° W: paleocoordinates 54.4° N, 71.8° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Bearpaw Formation, Late/Upper Campanian (83.5 - 70.6 Ma)

• Unit 4, upper part

• group of beds-level stratigraphic resolution

Environment/lithology: offshore; poorly lithified shale

Size class: macrofossils

Reposited in the USNM

Primary reference: F. S. Jensen and H. D. Varnes. 1964. Geology of the Fort Peck area, Garfield, McCone and Valley counties, Montana. United States Geological Survey Professional Paper 414-F:1-49 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 213077: authorized by Matthew Clapham, entered by Matthew Clapham on 24.08.2020

Creative Commons license: CC BY (attribution)