Where: Ventura County, California (34.3° N, 119.0° W: paleocoordinates 32.9° N, 110.8° W)

• coordinate based on political unit

• small collection-level geographic resolution

When: Leptauchenid Zone Member (Sespe Formation), Arikareean (29.5 - 18.5 Ma)

• Mason and Swisher 1989: "An overall age of 28.2 ± 0.2 Ma (weighted average) is indicated for the Willard Canyon tuff..." which is "60 m (200 ft.) above the top of Stock's (1934) "Leptauchenid Zone," and about 337 m (1100 ft.) above the type locality of Sespia californica."

•Figure 2 shows CIT 157 below the tuff.

Environment/lithology: fluvial-lacustrine; red siltstone and white sandstone

Size class: macrofossils

Reposited in the LACM

Primary reference: C. Stock. 1934. On the Occurrence of an Oreodont Skeleton in the Sespe of South Mountain, California. Proceedings of the National Academy of Sciences 20(9):518-523 [J. Alroy/J. Alroy/J. Ju]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 17670: authorized by John Alroy, entered by John Alroy on 26.03.1995, edited by Jonathan Marcot

Creative Commons license: CC BY (attribution)