Abstract

Note: This paper is dedicated to Aaron and Elizabeth Waters on the occasion of Dr. Waters' retirement.

A 30-yr photographic record of a shale pediment in the Henry Mountains region, southeastern Utah, shows almost no change in the position and shape of minute rills or the position of small stones scattered on the surface. The shale formations in that region are greatly eroded by every storm, as is plainly indicated by the sediment load carried to the main streams. Therefore, the rapid erosion must be concentrated in the badland slopes at the heads of the pediments. It is not surprising that the steep slopes erode rapidly; I am surprised to discover so little change on the pediments, and conclude that they are truly graded surfaces.

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