By K.W. Glennie (Eds.)
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Extra resources for Desert Sedimentary Environments
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. The bed forms that result from different 30 WADIS AND DESERT FLUVIATILE SEDIMENTS regimes of stream-flow have been described in some detail by such workers as SIMONS and RICHARDSON (1963, 1966), JOPLING(1963, 1965), ALLEN(1 963, 1968a, b) and MIDDLETON (1965).
48 WADIS A N D DESERT FLUVIATILE SEDIMENTS Deflation gravel of some higher level of wadi. Foresetted slightly pebbly windtransported sand. Horizontally bedded gravel with top portion deflated away. Finely laminated wind-blown land. Wind from left to right Clay flakes, slightly curled, Fine ripple lamination in windtransported sand. 36. lnterbedded wind- and water-transported sediment. Wadi Amayri, Oman. lNTERBEDDED WAD1 GRAVELS AND AEOLIAN SAND Also in Wadi Dhaid, but farther downstream, the pebble content of the wadi sediments is reduced to fairly thin beds between wind- and water-transported sands.
Taken. Sand grains are too heavy to go into suspension in any normal wind. Even in areas essentially of sand accumulation, if the supply of sand is insufficient to cover the interdune areas as well as the dunes, then deflation of the interdune areas continues. 10 from the eastern edge of the Rub a1 Khali, Arabia, shows low areas of chalkified Eocene limestone outcrop, a deflation lag of angular limestone pebbles, sand drifts on the protected leeward side of outcrops, and, in the distance, a line of sand dunes to which much of the deflated limestone is blown.
Desert Sedimentary Environments by K.W. Glennie (Eds.)