Antelope Head Quarry (AHQ): Middle Campanian - Late/Upper Campanian, Montana

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Chondrichthyes - Rajiformes - Rhinobatidae
Myledaphus sp. Cope 1876
Fiorillo 1997
Reptilia - Theropoda
Theropoda informal indet. A Marsh 1881
Fiorillo and Currie 1994 10 specimens
Reptilia - Troodontidae
Troodon formosus Leidy 1856
Fiorillo and Currie 1994 1 specimen
Reptilia - Tyrannosauridae
cf. Tyrannosauridae indet. Osborn 1906
Reptilia - Ceratopsidae
cf. Chasmosaurus sp. Lambe 1914
Reptilia
Stegoceras sp. Lambe 1902
Reptilia - Hadrosauridae
Hadrosauridae indet. Cope 1869
Hadrosaurinae indet. Lambe 1918
Reptilia - Crocodylia
Leidyosuchus sp. Lambe 1907
    = Crocodylia indet. Owen 1842
Alroy 2007
Reptilia
Champsosaurus sp. Cope 1876
Reptilia - Testudines - Trionychidae
Aspideretes sp. Hay 1904
    = Trionychinae indet. Gray 1825
Alroy 2007
Reptilia - Testudines - Nanhsiungchelyidae
Basilemys sp. Hay 1902
see common names

Geography
Country:United States State/province:Montana County:Wheatland
Coordinates: 46.4° North, 109.7° West (view map)
Paleocoordinates:53.6° North, 76.6° West
Basis of coordinate:based on nearby landmark
Geographic resolution:small collection
Time
Period:Cretaceous Epoch:Late/Upper Cretaceous
Stage:Campanian 10 m.y. bin:Cretaceous 7
Key time interval:Middle Campanian - Late/Upper Campanian
Age range of interval:83.60000 - 72.10000 m.y. ago
Stratigraphy
Geological group:Montana Formation:Judith River
Stratigraphic resolution:bed
Lithology and environment
Primary lithology: mudstone
Includes fossils?Y
Environment:crevasse splay
Taphonomy
Modes of preservation:body
Size of fossils:mesofossils
Associated major elements:some
Disassociated major elements:some
Collection methods and comments
Collection methods:bulk,field collection
Reason for describing collection:general faunal/floral analysis
Metadata
Database number:50907
Authorizer:M. Carrano, J. Alroy Enterer:M. Carrano, J. Alroy
Modifier:M. Carrano Research group:vertebrate
Created:2005-05-24 07:40:01 Last modified:2021-09-10 12:47:29
Access level:the public Released:2005-05-24 07:40:01
Creative Commons license:CC BY
Reference information

Primary reference:
1487. 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]

Secondary references:

19636 J. Alroy. 2007. Synonymies and reidentifications of North American fossil vertebrates and so forth. [J. Alroy/J. Alroy]
1488 A. R. Fiorillo. 1997. Stratigraphic distribution of fossil vertebrates in the Judith River Formation (Upper Cretaceous) of Wheatland and Golden Valley counties, south-central Montana. Northwest Geology 27:1-12 [J. Alroy/J. Alroy/M. Carrano]
13752ETE A. R. Fiorillo and P. J. Currie. 1994. Theropod teeth from the Judith River Formation (Upper Cretaceous) of south-central Montana. Journal of Vertebrate Paleontology 14(1):74-80 [M. Carrano/M. Carrano/M. Carrano]