IMNH 890 (Miocene of the United States)

Where: Nez Perce County, Idaho (46.0° N, 116.7° W: paleocoordinates 45.9° N, 110.7° W)

• coordinate based on political unit

• small collection-level geographic resolution

When: Imnaha Basalt Formation, Hemingfordian (20.4 - 16.0 Ma)

Environment/lithology: terrestrial; lithology not reported

Primary reference: A. R. Tedrow and J. E. Martin. 1998. Idaho Museum of Natural History Occasional Paper 36:21-24 [J. Alroy/J. Alroy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 18928: authorized by John Alroy, entered by John Alroy on 15.05.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

• roughly equivalent horizon in same section dated at 17.5 +/- 0.3 Ma (Ar/Ar on basalt)
only one specimen was recovered
Mammalia
 Tribosphenida - Plesiosoricidae
Plesiosorex cf. coloradensis Wilson 1960 placental