This study describes the history of sedimentation of a Plio/Pleistocene sedimentary body which today is extensively exposed along the eastern shore of Lake Turkana (N. Kenya). A framework for the stratigraphic correlation has been established by identifying suitable marker horizons and tracing as many as possible between measured stratigraphic sections in different parts of the basin. Measurements of variations in the thicknesses defined by the intercepts that the horizons make with the sections serve to define the geometry of the layers. Detailed records of the lithologies from the measured sections allow the recognition of facies divisions within each stratigraphic interval. Recent sedimentary environments, located in and around Lake Turkana are described and used as potential analogues for a palaeoenvironmental interpretation of the sedimentary facies recognised. The palaeoenvironments so identified are incorporated in the stratigraphic framework and an assessment of the history of sedimentation in the study area is presented. Sediment volume data derived from the measured sections has been synthesised by computer. The resulting isopach maps indicate the change in shape of the sediment body and this reflects the tectonic deformation of the study area. The analysis of the sediment body in terms of the correlation, environmental and tectonic character allows the fundamental controls of sedimentation to be identified.