Thornton Beach (Pleistocene of the United States)

Also known as UCMP V-99892

Where: San Mateo County, California (37.7° N, 122.5° W: paleocoordinates 37.7° N, 122.5° W)

• coordinate based on political unit

• small collection-level geographic resolution

When: Merced Formation, Ionian (0.8 - 0.1 Ma)

• lower Merced Formation

•Taken in full, these 87Sr/86Sr dates indicate an age of 620–670 ka for UCMP 236084, or more conservatively 590–700 ka in age (middle Pleistocene; Ionian equivalent).

Environment/lithology: terrestrial; siltstone

• The fossil-bearing horizon (UCMP locality V99892; Fig. 1d) is a massive siltstone rich in mollusk shells and woody debris, including well- preserved conifer cones.

Size class: macrofossils

Reposited in the UCMP

Primary reference: R. W. Boessenecker. 2018. A Middle Pleistocene Sea Otter from Northern California and the Antiquity of Enhydra in the Pacific Basin. Journal of Mammalian Evolution 25:27-35 [M. Uhen/M. Uhen/M. Uhen]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 183506: authorized by Mark Uhen, entered by Mark Uhen on 01.01.2017

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Mammalia
 Carnivora - Mustelidae
Enhydra sp.
Enhydra sp. Fleming 1822 sea otter