Pediment (Geology) (1) A broad, gently sloping rock surface at the base of a steeper slope, often covered with Alluvium, formed primarily by erosion. (2) A broad, flat or gently sloping, rock-floored erosion surface or plain of low relief, typically developed by subaerial agents (including running water) in an arid or semiarid region at the base of an abrupt and receding mountain front or plateau escarpment, and underlain by bedrock (occasionally by older alluvial deposits) that may be bare but more often partly mantled with a thin and discontinuous veneer of alluvium derived from the upland masses and in transit across the surface. The longitudinal profile of a pediment is normally slightly concave upward, and its outward form may resemble a bajada (which continues the forward inclination of a pediment). Unlike a Bajada, however, which a it closely resembles, a pediment is a surface of erosion whereas a bajada is a surface of deposition. In fact, the top of a bajada often merges with trailing portions of a pediment.
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Author of the Water Words Dictionary source of text: Gary A. Horton
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