Volcanic Record of the Adu-Asa Formation

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

in Ardipithecus kadabba

Published by University of California Press

Published in print June 2009 | ISBN: 9780520254404
Published online March 2012 | e-ISBN: 9780520942509 | DOI:
Volcanic Record of the Adu-Asa Formation

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This chapter examines the Mio-Pliocene volcanic materials exposed along the western margin of the Middle Awash area, with a primary focus on the late Miocene deposits of the Adu-Asa Formation. The primary goals of this chapter are to: define the different types of volcanic material preserved in the Adu-Asa Formation; present a working composite stratigraphic view of the Adu-Asa Formation volcanic horizons; present the existing geochemical data for western margin volcanic samples, including some with uncertain chronostratigraphic context; illustrate the data and observations that provided the basis for previous correlations and naming of key volcanic marker horizons; and illustrate the data and observations that provide new regional correlations and hence the establishment of newly named volcanic horizons.

Keywords: Mio-Pliocene; volcanic materials; Middle Awash; Adu-Asa Formation; volcanic samples; volcanic horizons

Chapter.  12672 words.  Illustrated.

Subjects: Evolutionary Biology

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