Antelope Head Quarry (AHQ) (Cretaceous to of the United States)

Where: Wheatland County, Montana (46.4° N, 109.7° W: paleocoordinates 53.6° N, 76.6° W)

• coordinate based on nearby landmark

• small collection-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: crevasse splay; mudstone

Size class: mesofossils

Collection methods: bulk,

Primary reference: A. R. Fiorillo. 1989. The vertebrate fauna from the Judith River Formation (Late Cretaceous) of Wheatland and Golden Valley counties, Montana. Mosasaur 4:127-142 [J. Alroy/J. Alroy/H. Street]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 50907: authorized by Matthew Carrano, entered by Matthew Carrano on 24.05.2005, edited by John Alroy

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Reptilia
 Loricata -
Crocodylia indet.1
Crocodylia indet.1 crocodilian
 Ornithischia - Hadrosauridae
Hadrosauridae indet., Hadrosaurinae indet.
Hadrosauridae indet. Cope 1869 hadrosaurid
Hadrosaurinae indet. Lambe 1918 hadrosaurine
 Ornithischia -
Stegoceras sp.
Stegoceras sp. Lambe 1902 ornithischian
 Ornithischia - Ceratopsidae
cf. Chasmosaurus sp.
cf. Chasmosaurus sp. Lambe 1914 ceratopsid
 Theropoda -
Theropoda "indet. A"3
 Theropoda - Troodontidae
Troodon formosus3
Troodon formosus3 Leidy 1856 maniraptoran
 Theropoda - Tyrannosauridae
cf. Tyrannosauridae indet.
cf. Tyrannosauridae indet. Osborn 1906 tyrannosaurid
 Choristodera -
Champsosaurus sp.
Champsosaurus sp. Cope 1876 choristodere
 Testudines - Trionychidae
Trionychinae indet.1
Trionychinae indet.1 Gray 1825 softshell turtle
 Testudines - Nanhsiungchelyidae
Basilemys sp.
Basilemys sp. Hay 1902 turtle
Chondrichthyes
 Rajiformes - Rhinobatidae
Myledaphus sp.2
Myledaphus sp.2 Cope 1876 guitarfish
1Alroy 2007; 2Fiorillo 1997; 3Fiorillo and Currie 1994