DescriptionSedimentary strata exposed in the region of North Turkwel, in the Lake Turkana Basin of northern Kenya, are described here in detail for the first time. Research undertaken here has 1) investigated the spatial distribution of facies through geologic mapping and sedimentary analysis, 2) documented a sequence of events through relative dating and radiocarbon age analysis of ostracods from two sections and 3) made comparisons between facies sequences in the study area and previously published lake level curves for the last 13,000 cal. yr BP in the Turkana Basin. Investigated strata from North Turkwel are comprised of deltaic and lacustrine deposits of the Galana Boi Formation that displays distinct characteristics when compared to previous research and Galana Boi deposits from the northeastern lake margin. These differences are attributed to each region’s fluvial system (Turkwel vs. Omo River), terrane of the drainage basin (metamorphic vs. volcanic), and wind patterns that affect lake currents and the distribution of sediment (high vs. low energy shoreline and wave vs. fluvial-dominated deltas). The majority of investigated deposits in this study formed during the latest Pleistocene to Holocene pluvials of the African Humid Period (AHP) in which the Turkana Basin experienced two lake highstand phases from 11,500 to 5,300 cal. yr BP. Facies analyses show grain size and sedimentary structure characteristics that correlate with a particular deltaic zone or lacustrine setting and are shaped by processes unique to this region. In North Turkwel, lacustrine and deltaic deposits have so far been located up to 70 meters above the present (2011) water surface of Lake Turkana and indicate transgression and regression episodes across the basin. In summary, this study reconstructs the paleoenvironment and paleogeography of North Turkwel during a humid climate of the Late Quaternary and evaluates the terrane, processes, and depositional patterns across a basin with vastly fluctuating lake levels.