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Stratigraphy, sedimentary facies and paleoenvironments, East Lake Turkana, KenyaThe East Lake Turkana sequence, some 325 m in thickness, has been differentiated into four lithostratigraphic units (Bowen & Vondra x973) . Four major lithofacies have been recognized: (i) the laminated siltstone facies ; (2) the arenaceous bioclastic carbonate facies; (3) the lenticular fine-grained sandstone and lentiadar-bedded siltstone facies and (4) the lenticular conglomerate, sandstone and mudstone facies. These represent: ( t) prodelta and shaUow-shelf lacustrine ; (2) littoral-lacustrine beach, barrier beach and lagoon; (3) delta plain-distributary channel and interdistributary flood basin and (4) fluvial channel and flood basin environments respectively.The East Lake Turkana basin was occupied by an embayment of the lake during the Plio-Pleistocene. This was filled by sediments provided by perennial and ephemeral streams and derived from older Cenozoic volcanics and Precambrian basement exposed along the basin margin and of the Stephanie Arch.

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