Characteristics of a Distributary Channel-Levee-Overbank System, Tanqua Karoo
A complex of distributary channel fills (termed here “distributary channel system”), exposed on the Bloukop farm, shows a complex internal architecture, comprised of seven individual channel fills, levee, and crevasse splay deposits. This distributary channel system is embedded in overbank deposits that reflect times when distributary channels were active elsewhere in the basin. Two types of channel fill illustrate the downdip morphologic changes of the individual feeder channels within a distributary channel system. The vertical stacking of each channel type within the outcrops reflects both the updip/downdip shift of the center of sheet sand deposition and its lateral movement within a sheet sand lobe.