pediment

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pediment(concave slope, waning slope) A surface of low relief, partly covered by a skin of rock debris, which is concave-upward and slopes at a low angle (normally less than 5°) from the base of a mountain zone or scarp. Classically it is developed and has been investigated in the arid and semi-arid regions of the western USA. Pediments may coalesce to form a pediplain.

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