By K.W. Glennie (Eds.)
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This is possibly because the water in flood, which produced the later scouring, trapped air in the pore spaces of the aeolian sand instead of replacing the air by a potentially cementing fluid. A rather analogous situation has been described by STIEGLITZ and INDEN (1969) in which air-filled vesicles formed in the sediment of a dam spillway following heavy rain. 28 illustrates another Permian outcrop a few kilometres away in Maidencombe Bay, South Devon, and shows the braided nature of the wadi channels which were filled with angular pebbles set in a sandy matrix.
This is well seen on the southern edge of the Rub a1 Khali (Enclosure 1). Here, the wadi channels are partly filled with sediment, but at present the flow of water is not sufficient to carry sediment beyond the areas of outcrop. The existence of a more extensive system of rivers or wadis in former times ‘can be inferred from the fluviatile gravels now occupying the long sand-free intetdune corridors (or feidjs) along the southern edge of the Rub a1 Khali. Much of the sediment found in wadi channels is deposited under normal stream-flow conditions of deposition.
Wind-blown sand o n l y partly removed by flowing water. East of Tripoli, Libya. 25. Thin pebble layer deposited by Rowing water which only sculptured the previously deposited aeolian sand. Wadi Ouenine, Libya. horizontal bedding is considered to be characteristic of rapid flow, whereas climbing ripple lamination, convolute structures, festoon bedding and scoured surfaces are thought to result from a decrease in velocity during the waning stages of the flood. In the areas of the coarser gravels indicating high-energy stream flow, aeolian sands cannot withstand the erosive power of the flowing water (cf.