Abstract
ACCURATE dating of the Plio—Pleistocene sedimentary sequence in the East Rudolf basin of northern Kenya is urgently required to provide a time framework for the hominoid1,2, archaeological3,4 and other5,6 important finds in the area. A sequence of water-lain tuff horizons are intercalated with lacustrine, deltaic and fluviatile sediments7 and if a number of these tuffs can be dated with sufficient accuracy they could provide both the primary geochronological framework required and, by establishing correlations between East Rudolf sections and the world-wide geomagnetic reversal time scale, enable palaeomagnetic dating to be applied to those parts of the stratigraphy lying between the dated tuff horizons.
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