Crookston Bridge Quarry (Miocene of the United States)

Also known as Merycodus Quarry; UNSM Cr-15

Where: Cherry County, Nebraska (42.8° N, 100.8° W: paleocoordinates 43.4° N, 97.5° W)

• coordinate based on political unit

• small collection-level geographic resolution

When: Crookston Bridge Member (Valentine Formation), Barstovian (16.3 - 12.5 Ma)

Environment/lithology: terrestrial

Primary reference: M. R. Voorhies. 1990. Vertebrate paleontology of the proposed Norden Reservoir Area, Brown, Cherry and Keya Paha counties, Nebraska. Technical Report, Division of Archeological Research, Department of Anthropology, University of Nebraska 82-09 [J. Alroy/J. Alroy/J. Alroy]more details

PaleoDB collection 18109: authorized by John Alroy, entered by John Alroy on 05.08.1992, edited by Richard Hulbert

Creative Commons license: CC BY (attribution)

Taxonomic list

• "more than 700" UNSM specimens: Skinner and Johnson 1984
Aves
 Ciconiiformes - Ciconiidae
Mycteria milleri6 Short 1966 stork
Reptilia
 Testudines - Emydidae
Glyptemys valentinensis3 Holman and Fritz 2001 turtle
Mammalia
 Perissodactyla - Tapiridae
Tapiridae indet.7 Gray 1821 tapir
 Perissodactyla - Equidae
Merychippus cf. insignis7 Leidy 1856 horse
Hipparionini indet.1 Quinn 1955 hipparionine horse
Protohippus perditus7 Leidy 1858 horse
may include specimen of Skinner and Johnson 1984 from above quarry but in the same member: see their section 27, p. 339
 Artiodactyla - Antilocapridae
Ramoceros cf. osborni7 Matthew 1904 pronghorn
presumably includes "R. howardae" of Frick 1937
Merycodus warreni7 Leidy 1858 pronghorn
includes type of "Merycodus warreni johnsoni": see Frick 1937
 Artiodactyla - Camelidae
Procamelus occidentalis7 Leidy 1858 camel
 Carnivora - Canidae
Aelurodon ferox8 Leidy 1858 bone-crushing dog
Paratomarctus temerarius8 Leidy 1858 bone-crushing dog
Leptocyon vafer7 Leidy 1858 canine
may include specimen of Skinner and Johnson 1984 from just above quarry but in the same member: see their section 27, p. 339
 Carnivora - Mustelidae
Mionictis sp.2 Matthew 1924 otter
said to be new and the same as Myers Farm species; listed as M. sp. by Voorhies 1990, and Mionictis omitted from Myers Farm by Voorhies
 Rodentia - Castoridae
Monosaulax skinneri5 Stout 1999 beaver
Prodipoides burgensis5 Korth 2002 beaver
 Rodentia - Mylagaulidae
Ceratogaulus rhinocerus4 Matthew 1902 rodent