BCT Quarry, "B" Horizon (Cretaceous to of the United States)

Also known as Salt Sage Coulee

Where: Petroleum County, Montana (46.8° N, 108.0° W: paleocoordinates 53.5° N, 74.6° W)

• coordinate estimated from map

• outcrop-level geographic resolution

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

• bed-level stratigraphic resolution

Environment/lithology: terrestrial; lithified, fine, brown, red, white, yellow sandstone and gray, green, yellow claystone

• "The 'B' Horizon consisted of white to buff, tan to light orange-brown, very fine grained to fine grained, strongly cemented, cross-laminated lithic-wacke sandstone, lithic-arenite sandstone, and at least one prominent greenish-gray to tan claystone."

Size classes: macrofossils, mesofossils

Collected by M. Triebold in 2002

Collection methods: surface (in situ),

Primary reference: W. W. Stein and M. Triebold. 2013. Preliminary analysis of a sub-adult tyrannosaurid skeleton from the Judith River Formation of Petroleum County, Montana. In J. M. Parrish, R. E. Molnar, P. J. Currie, & E. B. Koppelhus (eds.), Tyrannosaurid Paleobiology 54-77 [M. Carrano/M. Carrano/M. Carrano]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 167801: authorized by Matthew Carrano, entered by Matthew Carrano on 03.04.2015

Creative Commons license: CC BY (attribution)

Taxonomic list

Osteichthyes
 Osteichthyes -
Osteichthyes indet. Huxley 1880 bony fish
Teeth and vertebrae
Mammalia
 Mammalia -
Mammalia indet. mammal
Teeth
Reptilia
 Theropoda - Tyrannosauridae
Tyrannosauridae indet. Osborn 1906 tyrannosaurid
Over 50 teeth and tooth fragments, possibly from Albertosaurus; skeletal elements of RMDRC 2002.MT-001
 Theropoda - Dromaeosauridae
Dromaeosauridae indet. Colbert and Russell 1969 maniraptoran
Teeth
 Theropoda - Troodontidae
Troodontidae indet. Gilmore 1924 maniraptoran
Teeth
 Ornithischia - Ceratopsidae
Ceratopsidae indet. Marsh 1888 ceratopsid
Worn teeth
 Ornithischia - Hadrosauridae
Hadrosauridae indet. Cope 1869 hadrosaurid
Quadrate, maxilla, small vertebrae
 Crocodylia -
Crocodylia indet. Owen 1842 crocodilian
Teeth