Confirmation of a late middle Pleistocene age for the Omo Kibish 1 cranium by direct uranium-series dating
Aubert, M., Pike, A.W.G., Stringer, C., Bartsiokas, A., Eggins, S., Day, M. and Grun, R. (2012) Confirmation of a late middle Pleistocene age for the Omo Kibish 1 cranium by direct uranium-series dating. Journal of Human Evolution, 63, (5), 704-710. (doi:10.1016/j.jhevol.2012.07.006).
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While it is generally accepted that modern humans evolved in Africa, the specific physical evidence for that origin remains disputed. The modern-looking Omo 1 skeleton, discovered in the Kibish region of Ethiopia in 1967, was controversially dated at ∼130 ka (thousands of years ago) by U-series dating on associated Mollusca, and it was not until 2005 that Ar–Ar dating on associated feldspar crystals in pumice clasts provided evidence for an even older age of ∼195 ka. However, questions continue to be raised about the age and stratigraphic position of this crucial fossil specimen. Here we present direct U-series determinations on the Omo 1 cranium. In spite of significant methodological complications, which are discussed in detail, the results indicate that the human remains do not belong to a later intrusive burial and are the earliest representative of anatomically modern humans. Given the more archaic morphology shown by the apparently contemporaneous Omo 2 calvaria, we suggest that direct U-series dating is applied to this fossil as well, to confirm its age in relation to Omo 1.
|Subjects:||C Auxiliary Sciences of History > CC Archaeology|
|Divisions:||Faculty of Humanities > Archaeology
|Date Deposited:||02 Oct 2012 13:46|
|Last Modified:||26 Apr 2013 07:06|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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