Where: Colorado (37.2° N, 104.5° W: paleocoordinates 43.6° N, 75.3° W)

• coordinate stated in text

• small collection-level geographic resolution

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

• upper part of the Pierre Shale, about 45–60 m below the base of the overlying Trinidad Sandstone

• bed-level stratigraphic resolution

Environment/lithology: marine; gray shale

Size class: macrofossils

Primary reference: T. Ikejiri and S. G. Lucas. 2015. Osteology and taxonomy of Mosasaurus conodon Cope 1881 from the Late Cretaceous of North America. Netherlands Journal of Geosciences —– Geologie en Mijnbouw 94(1):39-54 [M. Uhen/C. Ruken/P. Mannion]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 233378: authorized by Philip Mannion, entered by Philip Mannion on 07.02.2024

Creative Commons license: CC BY (attribution)