“…The sediment is of mixed aeolian-fluvial origin (Ballieul, 1979, Lancaster 2000 and has been extensively reworked (McCarthy and Ellery, 1995;, Ringrose et al, 2002, 2005. Recent work has pointed to the source rocks of the Okavango Delta sediments as mainly Proterozoic granitoids, gabbros and related volcanic and orthometamorphic rocks (such as those) exposed in the catchment area in Angola, northern Namibia and northern Botswana At the present time, sediment derived from the catchment and deposited in the Delta is estimated at up to 170 000 t/a clastic bed load with a c. 39 000 tons suspended load component (McCarthy and Ellery, 1998).…”