Layer Cake (CU 28) ( of the United States)

Where: San Diego County, California (32.9° N, 117.1° W: paleocoordinates 32.7° N, 116.1° W)

• coordinate based on political unit

• small collection-level geographic resolution

When: Diablo/Olla Member (Palm Spring Formation), Blancan (4.9 - 1.8 Ma)

• said to be Blancan

Environment/lithology: terrestrial

Primary reference: M. L. Cassiliano. 1999. Biostratigraphy of Blancan and Irvingtonian mammals in the Fish Creek-Vallecito Creek section, southern California, and a review of the Blancan-Irvingtonian boundary. Journal of Vertebrate Paleontology 19(1):169-186 [J. Alroy/J. Alroy/J. Alroy]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 20097: authorized by John Alroy, entered by John Alroy on 21.09.1999

Creative Commons license: CC BY (attribution)

Taxonomic list

• spans the C2An.3n - C2Ar transition (3.58 Ma: Cande and Kent 1995)
Mammalia
 Artiodactyla - Camelidae
Hemiauchenia sp. Gervais and Ameghino 1880 camel
 Lagomorpha - Leporidae
Hypolagus vetus Kellogg 1910 rabbit
 Rodentia - Cricetidae
Hodomys sp. Merriam 1894 mouse
"Neotoma (Hodomys) sp."
 Rodentia - Heteromyidae
Perognathinae indet. Coues 1875 rodent