Sheep Mountain (CM) (Cretaceous of the United States)

Where: Carter County, Montana (45.5° N, 104.2° W: paleocoordinates 51.9° N, 77.4° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Lance Formation, Maastrichtian (72.1 - 66.0 Ma)

• bed-level stratigraphic resolution

Environment/lithology: terrestrial; lithology not reported

Size classes: macrofossils, mesofossils

Collected by J. L. Kay in 1937–1938; reposited in the CM

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

Primary reference: J. S. McIntosh. 1981. Annotated catalogue of the dinosaurs (Reptilia, Archosauria) in the collections of the Carnegie Museum of Natural History. Bulletin of Carnegie Museum of Natural History 18:1-67 [M. Carrano/M. Carrano/M. Carrano]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 142326: authorized by Matthew Carrano, entered by Matthew Carrano on 09.04.2013

Creative Commons license: CC BY (attribution)

Taxonomic list

Reptilia
 Dinosauria -
Dinosauria indet. dinosaur
CM 38330
 Avetheropoda - Troodontidae
"Stenonychosaurus inequalis" = Troodon formosus
"Stenonychosaurus inequalis" = Troodon formosus Leidy 1856 coelurosaur
CM 30748
 Avetheropoda - Tyrannosauridae
Tyrannosauridae indet. Osborn 1906 tyrannosaurid
CM 30749, 12102; teeth, femur
 Avetheropoda - Ornithomimidae
Ornithomimus sp. Marsh 1890 ornithomimid
CM 38322, 38326, 38323
 Neornithischia - Ceratopsidae
Ceratopsidae indet. Marsh 1888 ceratopsid
CM 12103
Triceratops sp. Marsh 1889 ceratopsid
CM 30744, 30746
 Neornithischia - Thescelosauridae
Thescelosaurus neglectus Gilmore 1913 ornithischian
CM 21787, 38327
 Neornithischia - Hadrosauridae
Edmontosaurus sp. Lambe 1917 hadrosaurine
CM 9970, 30745, 38321, 38324–5, 38328–9, 38333