Where: Pondera County, Montana (48.2° N, 112.5° W: paleocoordinates 55.9° N, 78.8° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Two Medicine Formation (Montana Group), Middle Campanian to Middle Campanian (83.5 - 70.6 Ma)

• mid-upper Two Medicine Formation (Middle to Upper Campanian; ~82.5 to 74.6 Ma)

• formation-level stratigraphic resolution

Environment/lithology: terrestrial; fine-grained, gray sandstone

Size class: macrofossils

Collected in 1999; reposited in the ROM

Primary reference: T. W. Dudgeon, J. C. Mallon, and D. C. Evans. 2023. The first report of Champsosaurus lindoei (Choristodera: Champsosauridae) from the Campanian of the United States: anatomical, phylogenetic, and palaeoecological significance. Zoological Journal of the Linnean Society [P. Mannion/P. Mannion]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 231393: authorized by Philip Mannion, entered by Philip Mannion on 18.08.2023

Creative Commons license: CC BY (attribution)