JDNM-83, Whitecap Knoll (Eocene of the United States)

Where: Wheeler County, Oregon (44.9° N, 120.3° W: paleocoordinates 45.6° N, 107.1° W)

• coordinate estimated from map

When: Big Basin Member (John Day Formation), Duchesnean (40.4 - 37.2 Ma)

• "Duchesnean (early late Eocene), between Member A Ignimbrite dated 39.22 ± 0.03 Ma (Bestland et al., 1999) and Whitecap Knoll Tuff dated 38.4 ± 0.7 Ma (Manchester, 2000)."

Environment/lithology: terrestrial; lithology not reported

Size class: mesofossils

Primary reference: J. X. Samuels and W. W. Korth. 2017. The first Eocene rodents from the Pacific Northwest, USA. Palaeontologia Electronica 20.2.24A:1-17 [P. Holroyd/P. Holroyd/P. Holroyd]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 185944: authorized by Patricia Holroyd, entered by Patricia Holroyd on 27.05.2017, edited by Jonathan Marcot

Creative Commons license: CC BY (attribution)

Taxonomic list

Mammalia
 Rodentia - Ischyromyidae
Pseudotomus sp. Cope 1872 rodent
 Ungulata - Entelodontidae
Entelodontidae indet. Lydekker 1883 even-toed ungulate
LACM 5411