east side, Cow Creek (Cretaceous of the United States)

Where: Fergus County, Montana (47.8° N, 108.9° W: paleocoordinates 54.6° N, 74.2° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Eagle Sandstone Formation (Montana Group), Campanian (83.6 - 72.1 Ma)

• bed-level stratigraphic resolution

Environment/lithology: terrestrial; lithology not reported

Size class: macrofossils

Collected by J. B. Hatcher in 1888; reposited in the USNM

Collection methods: surface (float), surface (in situ),

• now lost

Primary reference: O. C. Marsh. 1890. Description of new dinosaurian reptiles. The American Journal of Science, series 3 39:81-86 [M. Carrano/M. Carrano/M. Carrano]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 52873: authorized by Matthew Carrano, entered by Matthew Carrano on 25.08.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

 Avetheropoda - Tyrannosauridae
Ornithomimus grandis n. sp. Marsh 1890 tyrannosaurid