Cow Island (Cretaceous to of the United States)

Where: Blaine County, Montana (47.8° N, 108.9° W: paleocoordinates 54.7° N, 75.1° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Judith River Formation (Montana Group), Middle Campanian to Middle Campanian (83.5 - 70.6 Ma)

• formation-level stratigraphic resolution

Environment/lithology: terrestrial; lithology not reported

Size classes: macrofossils, mesofossils

Collected by J. C. Isaac in 1876

Collection methods: surface (float),

Primary reference: E. D. Cope. 1877. Report on the geology of the region of the Judith River, Montana, and on vertebrate fossils obtained on or near the Missouri River. Bulletin of the United States Geological and Geographical Survey 3(3):565-597 [M. Carrano/M. Carrano/E. Vlachos]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 58156: authorized by Matthew Carrano, entered by Kaitlin Maguire on 25.01.2006, edited by Matthew Carrano

Creative Commons license: CC BY (attribution)

Taxonomic list

Reptilia
 Avetheropoda - Tyrannosauridae
"Laelaps falculus n. sp." = Gorgosaurus libratus1
"Laelaps falculus n. sp." = Gorgosaurus libratus1 Lambe 1914 tyrannosaurid
"several teeth"
 Neornithischia - Hadrosauridae
Pteropelyx grallipes n. gen. n. sp.2
Pteropelyx grallipes n. gen. n. sp.2 Cope 1889 hadrosaurid
mandible with teeth