Chapter

Geochronology

Paul R. Renne, Leah E. Morgan, Giday Woldegabriel, William K. Hart and Yohannes Haile-Selassie

in Ardipithecus kadabba

Published by University of California Press

Published in print June 2009 | ISBN: 9780520254404
Published online March 2012 | e-ISBN: 9780520942509 | DOI: http://dx.doi.org/10.1525/california/9780520254404.003.0004
Geochronology

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40Ar/39Ar dating has been applied extensively to volcanic units of late Miocene to Pleistocene age in the Middle Awash study area, and is the most important dating method applied to these deposits. This chapter discusses all available 40Ar/39Ar data for the Adu-Asa Formation, including some data not previously reported, plus some previously unpublished results from the nearby Central Awash Complex (CAC). The methods and facilities employed for 40Ar/39Ar dating is divided into two different approaches: incremental heating and single-crystal total fusion.

Keywords: 40Ar/39Ar dating; late Miocene; Pleistocene; Middle Awash; dating; Adu-Asa Formation; Central Awash Complex; CAC; incremental heating; single-crystal total fusion

Chapter.  3954 words.  Illustrated.

Subjects: Evolutionary Biology

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