Abstract
Stone tools and numerous vertebrate fossils including hominids, have been found in close stratigraphic proximity to the KBS Tuff, whose age has been the subject of much debate. Concordant K–Ar ages, averaging 1.89 ± 0.01 Myr, are reported on anorthoclase phenocrysts from 13 pumice clasts collected from within the KBS Tuff or its correlatives. We believe that this age is the best estimate currently available for the time of formation of this important marker horizon within the East Turkana Basin.
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