Where: McCone County, Montana (47.9° N, 106.3° W: paleocoordinates 54.1° N, 71.3° W)

• coordinate stated in text

When: Bearpaw Shale Formation (Montana Group), Campanian (83.6 - 72.1 Ma)

Environment/lithology: offshore; lithified, bentonitic, concretionary, gray, muddy, silty mudstone

Size class: macrofossils

Preservation: mold/impression, adpression, concretion, replaced with pyrite

Primary reference: W. B. Gallagher. 1993. The Cretaceous/Tertiary mass extinction event in the North Atlantic coastal plain. The Mosasaur 5:75-154 [M. Carrano/M. Carrano]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 167793: authorized by Matthew Carrano, entered by Matthew Carrano on 02.04.2015

Creative Commons license: CC BY (attribution)