BCT Quarry, "A" 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, medium-grained, brown, red, yellow sandstone and concretionary, sideritic, black, brown, red, yellow ironstone

• "The 'A' Horizon consisted of a medium orange-brown, highly cemented, medium-grained, lithic-wacke sandstone with abundant, large, irregular, black, orange-brown and red-brown sideritic ironstone concretions."

Size classes: macrofossils, mesofossils

• Shed tyrannosaur teeth also indicate predation.

Collected by M. Triebold in 2002; reposited in the AMNH

Collection methods: surface (float), 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: general faunal/floral analysis

PaleoDB collection 167800: 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
vertebrae
Reptilia
 Testudinata -
Testudinata indet. Oppel 1811 turtle
shell fragments
 Testudines - Trionychidae
Trionychidae indet. softshell turtle
Braincase
 Theropoda - Dromaeosauridae
Dromaeosauridae indet. Colbert and Russell 1969 maniraptoran
Claws, vertebrae, teeth
 Ornithischia - Hypsilophodontidae
Hypsilophodontidae indet. hypsilophodontid
Femur
 Ornithischia - Hadrosauridae
Hadrosauridae indet. Cope 1869 hadrosaurid
Isolated hadrosaur. Ulna, fibula, vertebrae
 Crocodylia -
Crocodylia indet. Owen 1842 crocodilian
Teeth
Deinosuchus sp. Holland 1909 crocodilian
Tooth
Chondrichthyes
 Rajiformes - Rhinobatidae
Myledaphus sp. Cope 1876 guitarfish
Teeth