oa Madoqua - Relict vlei silts of the middle Kuiseb River valley, South West Africa



Relict fine-grained sediments have been preserved within erosion gullies (gramadullas) of the middle Kuiseb river valley in the Namib desert. These deposits are divisible into a conspicuous higher terrace and a concealed, eroded low level type. Discontinuous remnants, commonly yellowish-grey silts containing subsidiary sands, have been traced from Gobabeb 40,5 km upstream. The diverse mineralogy of the deposits reflects their metamorphic rock source. Bedding is distinct but sand and silt units are irregular in form. Sedimentary structures include cross-stratification and sun cracks.


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