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Ardipithecus kadabbaLate Miocene Evidence from the Middle Awash, Ethiopia$
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Yohannes Haile-Selassie

Print publication date: 2009

Print ISBN-13: 9780520254404

Published to California Scholarship Online: March 2012

DOI: 10.1525/california/9780520254404.001.0001

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(p.92) (p.93) 4 Geochronology
Ardipithecus kadabba

Paul R. Renne

Leah E. Morgan

Giday Woldegabriel

William K. Hart

Yohannes Haile-Selassie

University of California Press

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available 40Ar/39Ar data for the Adu-Asa Formation, including some data not previously reported, plus some previously unpublished results from the nearby Central Awash Complex (CAC).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

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