UCMP V-6869, Maxum ( of the United States)

Where: Contra Costa County, California (37.8° N, 122.0° W: paleocoordinates 37.6° N, 121.0° W)

• coordinate based on political unit

• small collection-level geographic resolution

When: Tassajara Formation, Blancan (4.9 - 1.8 Ma)

• Reported as Blancan 1 in Hutchison 1987

Environment/lithology: terrestrial; lithology not reported

Size class: macrofossils

Reposited in the UCMP

Primary reference: J. H. Hutchison. 1987. Moles of the Scapanus latimanus group (Talpidae, Insectivora) from the Pliocene and Pleistocene of California. Contributions in Science, Natural History Museum of Los Angeles County 386:1-15 [J. Alroy/J. Alroy/W. Gearty]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 19713: authorized by John Alroy, entered by John Alroy on 26.03.1995, edited by Patricia Holroyd

Creative Commons license: CC BY (attribution)

Taxonomic list

• Lawlor Tuff is within formation and has been dated at 4.1 +/- 1.0 and 4.6 +/- 0.5 Ma: Tedford et al. 1987; both of these dates have unacceptably large errors
overlies Hemme Hills: Tedford et al. 1987
said to be earliest Blancan
Mammalia
 Rodentia - Cricetidae
Postcopemys maxumensis n. sp.2 Lindsay and Czaplewski 2011 mouse
Postcopemys repenningi2 Lindsay and Czaplewski 2011 mouse
Repomys maxumi n. sp.3 May 1981 mouse
Ogmodontomys sawrockensis1 Hibbard 1957 mouse
 Theriamorpha - Talpidae
Scapanus sp. Pomel 1848 mole
possibly a new species