ZXBar (Neogene of the United States)

Also known as Cook's Pliohippus Quarry

Where: Sioux County, Nebraska (42.4° N, 103.8° W: paleocoordinates 42.7° N, 102.1° W)

• coordinate based on political unit

• small collection-level geographic resolution

When: Johnson Member (Snake Creek Formation), Hemphillian (10.3 - 4.9 Ma)

Environment/lithology: terrestrial

Primary reference: M. F. Skinner, S. M. Skinner, and R. J. Gooris. 1977. Stratigraphy and biostratigraphy of late Cenozoic deposits in central Sioux County, western Nebraska. Bulletin of the American Museum of Natural History 158(5):263-370 [J. Alroy/J. Alroy/J. Alroy]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 18499: authorized by John Alroy, entered by John Alroy on 05.08.1992

Creative Commons license: CC BY (attribution)

Taxonomic list

• presumably includes all material from the Upper Snake Creek of Pliohippus Draw that does NOT come from The Pits
specimen of Agriotherium sp. could be from the Laucomer Mbr.
 Rodentia - Geomyidae
Pliogeomys russelli n. sp.4 Korth 1995 pocket gopher
 Rodentia - Heteromyidae
"Prodipodomys coquorum" = Perognathus coquorum1
"Prodipodomys coquorum" = Perognathus coquorum1 Wood 1935 pocket mouse
 Lagomorpha - Leporidae
 Lipotyphla - Talpidae
Gaillardia thomsoni n. sp. Matthew 1932 mole
see Matthew 1932b
 Perissodactyla - Equidae
Dinohippus leidyanus n. sp. Osborn 1918 horse
 Carnivora - Procyonidae
Arctonasua eurybates n. sp.2 Baskin 1982 procyonid carnivore
"Upper channel fill in Pliohippus Draw... Johnson Member"
 Carnivora - Mustelidae
Pliotaxidea nevadensis Butterworth 1916 badger
described by Cook and Macdonald 1962, from "Pliohippus Draw... Pliohippus leidyanus level"
 Carnivora - Canidae
Borophagus secundus1 VanderHoof 1931 bone-crushing dog
 Xenarthra - Megalonychidae
Megalonyx curvidens Matthew 1924 edentate
 Artiodactyla - Tayassuidae
Prosthennops serus Cope 1877 peccary
 Artiodactyla - Camelidae
Megatylopus gigas Matthew and Cook 1909 camel
probable type locality
 Artiodactyla - Merycoidodontidae
"Merychyus cf. major" = Ustatochoerus major1
"Merychyus cf. major" = Ustatochoerus major1 Leidy 1858 oreodont
 Artiodactyla - Palaeomerycidae
Pediomeryx cf. hemphillensis Stirton 1936 ruminant
 Artiodactyla - Bovidae
Neotragocerus improvisus n. sp. Matthew and Cook 1909 antelope