Peterson Creek (Middle MV 7303) ( of the United States)

Also known as Big Wash North; ISU 59003; Rodent Wash; South Bluff

Where: Lemhi County, Idaho (45.0° N, 113.6° W: paleocoordinates 46.2° N, 107.8° W)

• coordinate based on political unit

• small collection-level geographic resolution

When: Peterson Creek Beds Formation, Arikareean (30.8 - 20.4 Ma)

Environment/lithology: terrestrial

Primary reference: R. Nichols. 1976. Early Miocene mammals from the Lemhi Valley of Idaho. Tebiwa 18(2):9-47 [J. Alroy/J. Alroy/M. Uhen]more details

PaleoDB collection 17584: authorized by John Alroy, entered by John Alroy on 26.03.1995

Creative Commons license: CC BY (attribution)

Taxonomic list

• three separate localities/sections; Rodent Wash section is entirely above the others
most material is from the "middle" of the section
said to be "medial Arikareean"
a "Peterson Creek" list with no revisions whatsoever is given by Nichols 1998
"Allomys sp." Nichols 1979: South Bluff, base of section; this is higher than position of "M." yeariani but about 50' below most of the other small mammals; NISP 1
 Rodentia - Cricetidae
Paciculus montanus2 Black 1961 mouse
 Rodentia - Aplodontidae
Niglarodon sp. Black 1961 mountain beaver
middle of section at Big Wash
Niglarodon petersonensis1 Nichols 1976 mountain beaver
 Rodentia - Sciuridae
"Tamiini indet." = Marmotini3
"Tamiini indet." = Marmotini3 squirrel
Big Wash, middle of section
 Rodentia - Geomyidae
Entoptychus fieldsi Nichols 1976 pocket gopher
middle of section at Big Wash; type; (3 + 1)
 Rodentia - Castoridae
Castoridae indet.3 Gray 1821 beaver
 Rodentia - Mylagaulidae
Trilaccogaulus lemhiensis1 Nichols 1976 rodent
 Lagomorpha - Leporidae
? Palaeolagus sp.3 Leidy 1856 rabbit
middle of section at South Bluff and Big Wash; (4 + 5)
 Carnivora - Procyonidae
Procyonidae indet. Gray 1825 procyonid carnivore
 Ungulata - Merycoidodontidae
Merycoidodontidae indet. Cook 1912 oreodont
"Merycochoerus superbus" = Promerycochoerus superbus1 Leidy 1870 oreodont