Abstract
Cenozoic gravels along the rim of Sycamore Canyon are of two types: one containing rounded pebbles derived locally from the Shinarump conglomerate and developed in Pleistocene-Recent time; the other, angular pebbles derived from rocks similar to those exposed today in the Black Hills-Bradshaw Mountains area to the southwest and developed in the Miocene or Pliocene. The angular gravels were laid down, not upon a peneplain as suggested by Robinson, D. W. Johnson, et al ., but upon a pediment that extended northeastward from the mountains and covered that area of the Colorado plateau now occupied by Sycamore Canyon.
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