Where: Contra Costa County, California (37.8° N, 122.1° W: paleocoordinates 37.4° N, 119.6° W)

• coordinate based on political unit

• small collection-level geographic resolution

When: Lower Mulholland Member (Siesta Formation), Hemphillian (10.3 - 4.9 Ma)

• Originallly assigned to Mulholland Formation, but stratigraphic revisions now place in lower Mulholland Member of Siesta Formation. Stratigraphically between between the Upper Mulholland Tuff (8.2 Ma) and the Lower Mulholland Tuff (8.9 Ma)

Environment/lithology: terrestrial; lithology not reported

Size class: macrofossils

Reposited in the UCMP

Primary reference: R. A. Martin, T. S. Kelly, and P. Holroyd. 2023. Two Asian cricetodontine-like muroid rodents from the Neogene of western North America. Journal of Paleontology 1-19 [P. Holroyd/P. Holroyd]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 19446: authorized by John Alroy, entered by John Alroy on 19.05.2000, edited by Patricia Holroyd

Creative Commons license: CC BY (attribution)