Chapter

Comparison of the San Timoteo Badlands, Anza-Borrego Desert, and Arizona Faunal Successions

L. Barry Albright, III

in Biostratigraphy and Vertebrate Paleontology of the San Timoteo Badlands, Southern California

Published by University of California Press

Published in print August 2000 | ISBN: 9780520098367
Published online March 2012 | e-ISBN: 9780520915985 | DOI: http://dx.doi.org/10.1525/california/9780520098367.003.0004
Comparison of the San Timoteo Badlands, Anza-Borrego Desert, and Arizona Faunal Successions

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This chapter discusses temporal ranges of sixteen important taxa chronologically from faunas of comparable age in southern California and Arizona. The LSD for each taxon in each region is plotted to test the regional synchroneity of these faunal events. The LSD of Thomomys in the San Timoteo sequence is significantly earlier than in the Anza-Borrego or Arizona sequences. Thomomys first appears in the Badlands at about 3.8 Ma but not until about 2.4 Ma in the Vallecito Creek LF of the Anza-Borrego sequence. Geomys, in contrast, which has not been found in the San Timoteo Badland, first occurs in the Anza-Borrego sequence in the Arroyo Seco assemblage at about 3.5 Ma.

Keywords: taxa; Thomomys; Geomys; Ma; Seco

Chapter.  2050 words.  Illustrated.

Subjects: Evolutionary Biology

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