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)
 Rodentia - Cricetidae
Goniodontomys disjunctus Wilson 1937 mouse
Prosomys mimus Shotwell 1956 mouse
 Carnivora - Mustelidae
Mustelidae indet. Fischer 1817 mustelid carnivore
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