Surface of low relief, partly covered by a skin of rock debris, that 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.
Geography
A low, concave element at the foot of a hillslope (also called a concave, or waning, slope). See Strudley and Murray (2007) Geomorph. 88, 3–4 on the numerical simulation of pediment development.