North of Lewistown (Cretaceous of the United States)

Where: Fergus County, Montana (47.4° N, 109.1° W: paleocoordinates 54.3° N, 75.4° W)

• coordinate stated in text

• small collection-level geographic resolution

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

• bed-level stratigraphic resolution

Environment/lithology: marine; shale

Size class: macrofossils

Reposited in the USNM

Primary reference: D. A. Russell. 1964. The Skull of American Mosasaurs. 1-386 [M. Carrano/H. Street/P. Wagner]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 107718: authorized by Matthew Carrano, entered by Hallie Street on 14.04.2011

Creative Commons license: CC BY (attribution)

Taxonomic list

 Squamata - Mosasauridae
Mosasaurus missouriensis Harlan 1834 mosasaur
USNM 8086, skull