Abstract

Summary A detailed 2.3 km long seismic refraction line near Koobi Fora shows velocities increasing continuously with depth, apart from a 100 m thick low-velocity layer whose top lies at a depth varying from 100 to 250 m. This is thought to be a lacustrine sequence. Total thickness of rocks overlying basement is 1200–1300 m. Interpretations of four shorter profiles in this area are also presented, one of which indicates basement at only 40 m depth. These data are used to control the interpretation of part of the Bouguer gravity map of the region in terms of an upfaulted basement block partly coinciding with the Kokoi horst.

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