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Middle Pleistocene age of the fossiliferous sedimentary sequence from Tarija, Bolivia

Published online by Cambridge University Press:  20 January 2017

Bruce J. MacFadden ,
Peter K. Zeitler ,
Federico Anaya  and
John M. Cottle
Bruce J. MacFadden*
Affiliation:
Florida Museum of Natural History, University of Florida, Gainesville, FL, 32611, USA
Peter K. Zeitler
Affiliation:
Department of Earth and Environmental Sciences, Lehigh University, Bethlehem, PA 18015, USA
Federico Anaya
Affiliation:
Facultad de Ingeniería Geológica, Universidad Autónoma Tómas Frías, Potosí, Bolivia
John M. Cottle
Affiliation:
Department of Earth Sciences, University of California Santa Barbara, Santa Barbara, CA 93106, USA
*
*Corresponding author. E-mail address:[email protected] (B.J. MacFadden).
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Abstract

The highly fossiliferous sediments of the Tolomosa Formation from Tarija, southern Bolivia, represent one of the most important localities in South America that documents the Great American Biotic Interchange. Over the past several decades, chronostratigraphic studies have indicated a middle Pleistocene age for the Tolomosa Formation from ~ 1.1 to 0.7 Ma. This interval correlates to the Ensenadan South American Land Mammal Age as it is characterized from classic localities in Argentina. Recently, however, a new interpretation based on AMS 14C ages indicates that the fossiliferous sediments from Tarija are latest Pleistocene, i.e., < 44 ka, and thus of Lujanian age. Here we report a new age of 0.76 ± 0.03 Ma (2σ) based on 11 U–Th/Pb and U–Th/He individual determinations from the Tolomosa Formation. This is indistinguishable from the age published from the same ash in 1983, and was originally used to calibrate the magnetostratigraphic section at Tarija. The new age confirms that the age of the Tolomosa Formation is middle Pleistocene, and not latest Pleistocene. The age of the Tarija Fauna has significant implications with regard to the stage of evolution biochronology for Pleistocene fossil mammals in South America, and in particular, the classic and important reference sections in Argentina.

Keywords

BoliviaGABIGeochronologyMammalsPleistoceneSALMATarija
Type
Research Article
Information
Quaternary Research , Volume 79 , Issue 2 , March 2013 , pp. 268 - 273
Copyright
University of Washington

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