Where: Buffalo County, South Dakota (44.2° N, 99.7° W: paleocoordinates 49.0° N, 66.4° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

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

• in the Upper Cretaceous bed of the Pierre epoch

• formation-level stratigraphic resolution

Environment/lithology: marine; shale

Size class: macrofossils

Collected by J. H. Charles

Primary reference: E. D. Cope. 1894. On the structure of the skull in the plesiosaurian Reptilia, and on two new species from the Upper Cretaceous. Proceedings of the American Philosophical Society 33:109-113 [J. Alroy/E. Leckey/M. Carrano]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 28367: authorized by John Alroy, entered by Erin Leckey on 10.02.2003

Creative Commons license: CC BY (attribution)