Sheep Mountain (Cretaceous of the United States)

Where: Carter County, Montana (45.5° N, 104.2° W: paleocoordinates 51.8° N, 78.0° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Hell Creek Formation, Late/Upper Maastrichtian (70.6 - 66.0 Ma)

• described as uppermost Maastrichtian, Lancian NALMA

• bed-level stratigraphic resolution

Environment/lithology: "channel"; medium-grained, pyritic, sideritic sandstone

• "a 1-m-thick, medium-grained, cross-bedded sandstone unit with unionid bivalve shells that were replaced with siderite"; some pyrite found encrusting bones

Size classes: macrofossils, mesofossils

Preservation: replaced with siderite

Collected by B. Konecke in 1992

Collection methods: mechanical,

• Brig Konecke

Primary reference: C. J. Ott. 2007. Cranial anatomy and biogeography of the first Leptoceratops gracilis (Dinosauria: Ornithischia) specimens from the Hell Creek Formation, southeast Montana. In K. Carpenter (ed.), Horns and Beaks: Ceratopsian and Ornithopod Dinosaurs 213-233 [M. Carrano/M. Carrano/M. Carrano]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 73947: authorized by Matthew Carrano, entered by Matthew Carrano on 13.07.2007

Creative Commons license: CC BY (attribution)

Taxonomic list

 Unionida - Unionidae
Unionidae indet. Rafinesque 1820 freshwater mussel
 Neornithischia - Leptoceratopsidae
Leptoceratops gracilis Brown 1914 leptoceratopsid