Hell Creek (AMNH general) (Cretaceous of the United States)

Where: Garfield County, Montana (47.3° N, 108.2° W: paleocoordinates 54.4° N, 81.6° W)

• coordinate estimated from map

• outcrop-level geographic resolution

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

• 'Laramie deposits'

• group of beds-level stratigraphic resolution

Environment/lithology: terrestrial; lithology not reported

Size class: macrofossils

Collected by O. Hunter, B. Brown in 1904, 1906; reposited in the AMNH

• Found by Mr. Oscar Hunter in 1904 "and originally 'swapped' for a 'six-shooter' revolver" (Osborn 1909) then puchased in 1906 by Brown.

Primary reference: O. P. Hay. 1908. The fossil turtles of North America. Carnegie Institution of Washington Publication 75:1-568 [M. Carrano/M. Carrano/M. Carrano]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 131865: authorized by Roger Benson, entered by Roger Benson on 31.07.2012, edited by Matthew Carrano and Bethany Allen

Creative Commons license: CC BY (attribution)

Taxonomic list

Reptilia
 Testudines - Pantrionychidae
Plastomenus costatus Cope 1875 turtle
AMNH 6131, some portions of a carapace and a plastron. It is not certainly known that the various bones belong to the same individual.
 Ornithischia - Hadrosauridae
"Anatosaurus sp." = Edmontosaurus2
"Anatosaurus sp." = Edmontosaurus2 Lambe 1917 hadrosaurine
AMNH 5888
 Choristodera -
Champsosaurus laramiensis n. sp.1 Brown 1905 choristodere
AMNH 982 (holotype), nearly complete skull and skeleton
Champsosaurus ambulator n. sp.1 Brown 1905 choristodere
AMNH 983 (holotype), skull and nearly complete skeleton