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Geological Society, London, Special Publications; 1978; v. 6; p. 395-414;
DOI: 10.1144/GSL.SP.1978.006.01.27
© 1978 Geological Society of London

Part III. Regional Studies in the Gregory Rift Valley

Stratigraphy, sedimentary facies and paleoenvironments, East Lake Turkana, Kenya

Carl F. Vondra & Bruce E. Bowen

The East Lake Turkana sequence, some 325 m in thickness, has been differentiated into four lithostratigraphic units (Bowen & Vondra 1973). Four major lithofacies have been recognized: (1) the laminated siltstone facies; (2) the arenaceous bioclastic carbonate facies; (3) the lenticular fine-grained sandstone and lenticular-bedded siltstone facies and (4) the lenticular conglomerate, sandstone and mudstone facies. These represent: (1) prodelta and shallow-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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