Also known as Hancock Mammal Quarry; UCMP V-75203; JDNM-13; UO 2473; UWBM #C0082

Where: Wheeler County, Oregon (44.9° N, 120.2° W: paleocoordinates 46.4° N, 105.2° W)

• coordinate based on political unit

• small collection-level geographic resolution

When: uppermost Member (Clarno Formation), Middle Eocene (47.8 - 37.7 Ma)

• The Nut beds have yielded ages between 42 and 44Ma (Manchester 1994; Bestland et al. 1999) placing the locality within the Uintan NALMA. However, several authors have noted Bridgerian fauna from the Clarno vertebrate localities (Stirton 1944; Hanson 1996). Member A of the overlying John Day Formation was dated to ~39 Ma, suggesting the Clarno Formation is also younger than this. Mihlbachler and Samuels 2016 suggest that referring to the Clarno vertebrate localities in terms of NALMA ages is problematic, as Oregan biostratigraphy during the Eocene and Miocene is in need of greater study and the localities share taxa considered characteristic of multiple land mammal ages.

Environment/lithology: terrestrial; conglomerate and sandstone

Size class: macrofossils

Primary reference: C. B. Hanson. 1996. Stratigraphy and vertebrate faunas of the Bridgerian-Duchesnean Clarno Formation, north-central Oregon. In D. R. Prothero and R. J. Emry (eds.), The Terrestrial Eocene-Oligocene Transition in North America 206-239 [J. Alroy/J. Alroy/J. Marcot]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 16842: authorized by John Alroy, entered by John Alroy on 30.04.1994, edited by Patricia Holroyd and Jonathan Marcot

Creative Commons license: CC BY (attribution)