Rick Irwin Site (Neogene of the United States)

Also known as RIS; Wyman Creek

Where: Keya Paha County, Nebraska (42.8° N, 99.6° W: paleocoordinates 43.1° N, 97.8° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Late/Upper Hemphillian (10.3 - 4.9 Ma)

• unnamed formation above the Ash Hollow and below the Long Pine

Environment/lithology: "channel"; unlithified sandstone and unlithified conglomerate

• "channel fill"
• "unconsolidated sand and gravel"

Size classes: macrofossils, mesofossils

Collection methods: bulk, sieve,

• "15,000 identifiable macro- and microfossil specimens... intensive dry screening"

Primary reference: S. G. Tucker. 2003. Carnivores and microtine-like rodents from a new late Miocene (Hemphillian) locality in north-central Nebraska. Journal of Vertebrate Paleontology 23(3):105A [J. Alroy/J. Alroy/J. Alroy]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 35430: authorized by John Alroy, entered by John Alroy on 12.12.2003

Creative Commons license: CC BY (attribution)

Taxonomic list

• multiple important groups are omitted (e.g., artiodactyls, perissodactyls, most rodents, insectivores)
Mammalia
 Rodentia - Cricetidae
Goniodontomys disjunctus Wilson 1937 mouse
Prosomys mimus Shotwell 1956 mouse
 Carnivora - Mustelidae
Mustelidae indet. Fischer 1817 mustelid carnivore
"'Meles'-like"
Mustela sp. Linnaeus 1758 weasel
said to be new
Martinogale alveodens Hall 1930 skunk
Pliogale furlongi Merriam 1911 skunk
Pliotaxidea nevadensis Butterworth 1916 badger
 Carnivora - Canidae
Vulpes stenognathus Savage 1941 fox
Eucyon davisi Merriam 1911 canine
Carpocyon limosus Webb 1969 bone-crushing dog
 Carnivora - Felidae
Machairodus sp. Kaup 1833 cat