Cow Creek (Cretaceous of the United States)

Where: Blaine County, Montana (47.8° N, 108.9° W: paleocoordinates 54.5° N, 74.2° W)

• coordinate based on nearby landmark

When: Judith River Formation, Campanian (83.6 - 72.1 Ma)

Environment/lithology: estuary or bay; sandstone

• Sandstone with iron rock, small amounts of Taconite, with vulcanic residue and a

•ferruginous sandstone caprock overlying the secondary fish beds.The site is estuarine, swampy, with marine and fresh-water species and plesiosaur material.

Size classes: macrofossils, mesofossils

Primary reference: G. R. Case. 1978. A new selachian fauna from the Judith River Formation (Campanian) of Montana. Palaeontographica Abteilung A 160(Lfg. 1-6):176-205 [J. Kriwet/W. Glaeser/M. Carrano]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 69153: authorized by Juergen Kriwet, entered by Wolfgang Glaeser on 20.02.2007, edited by Matthew Carrano

Creative Commons license: CC BY (attribution)

Taxonomic list

Chondrichthyes
 Hybodontiformes - Hybodontidae
Hybodus montanensis n. sp. Case 1978 elasmobranch
 Rajiformes -
Protoplatyrhina renae n. gen. n. sp.
Protoplatyrhina renae n. gen. n. sp. Case 1978 guitarfish
 Sclerorhynchiformes - Sclerorhynchidae
Ischyrhiza mira Leidy 1856 elasmobranch
 Sclerorhynchiformes - Ptychotrygonidae
Ptychotrygon blainensis n. sp. Case 1978 elasmobranch
 Myliobatiformes - Dasyatidae
Myledaphus bipartitus Cope 1876 whiptail stingray
 Lamniformes - Anacoracidae
Squalicorax kaupi Agassiz 1843 crow shark
 Lamniformes - Cretoxyrhinidae
Plicatolamna arcuata Woodward 1894 mackerel shark
 Lamniformes - Odontaspididae
Hypotodus grandis n. sp. Case 1978 sand tiger shark
 Orectolobiformes -
Cretorectolobus olsoni n. gen. n. sp.
Cretorectolobus olsoni n. gen. n. sp. Case 1978 carpet shark
 Synechodontiformes - Palaeospinacidae
Synechodus andersoni n. sp. Case 1978 elasmobranch
Reptilia
 Plesiosauria -
Plesiosauria indet. plesiosaur
phalanges, centra
Mammalia
 Allotheria -
Multituberculata indet. Cope 1884 multituberculate
teeth, limb bones