LACM 4702 (Miocene of the United States)

Where: Kern County, California (35.3° N, 118.5° W: paleocoordinates 35.2° N, 115.3° W)

• coordinate estimated from map

When: Hemphillian mammal zone, Upper Dove Spring Member (Dove Spring Formation), Tortonian (11.6 - 7.2 Ma)

• "LACM 4702 is in the upper Dove Spring Formation. LACM 4702 and nearby localities are bracketed by radiometrically dated ashes at 9.7 ± 0.2 Ar/Ar and at 8.5 ± 0.13 Ar/Ar. The mammalian fauna at LACM 4702 is characteristic of the Hemphillian NALMA, and the locality is in a magnetozone correlated with chron C4An, 9.11–8.77 Ma. Based on

•the paleomagnetic data, I assigned LACM 4702 a minimum age of 8.77 Ma."

Environment/lithology: alluvial fan; paleosol/pedogenic, coarse-grained, cherty/siliceous gravel

• The aggregate depositional environment, paleoflora, and paleofauna suggest a semi-arid but well-vegetated ecosystem containing ephemeral streams.
• LACM 4702, contains strata composed of relatively coarse-grained alluvial fan deposits and paleosols with siliceous hardpans that indicate a semi-arid climate.

Size class: macrofossils

Reposited in the LACM

Primary reference: S. G. Scarpetta. 2019. The first known fossil Uma: ecological evolution and the origins of North American fringe-toed lizards. BMC Evolutionary Biology 19(178):1-22 [T. Cleary/T. Cleary]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 204601: authorized by Terri Cleary, entered by Terri Cleary on 13.09.2019

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Reptilia
 Squamata - Phrynosomatidae
Phrynosomatidae indet., Uma sp.
Phrynosomatidae indet. Fitzinger 1843 squamates
LACM 159790, maxilla; 159744, dentary; 159717, dentary
Uma sp. Baird 1858 squamates
LACM 159892, partial and fused premaxilla