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.
Mammalia
 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 - Mustelidae
Pliotaxidea nevadensis Butterworth 1916 badger
described by Cook and Macdonald 1962, from "Pliohippus Draw... Pliohippus leidyanus level"
 Carnivora - Procyonidae
Arctonasua eurybates n. sp.2 Baskin 1982 procyonid carnivore
"Upper channel fill in Pliohippus Draw... Johnson Member"
 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