Glacial moraines, terraces and pediments of Grand Valley, western Colorado
— Scott Sinnock


This paper discusses a set of late Pleistocene landforms in the Grand Valley of western Colorado (fig. 1). More detailed discussion is available in Sinnock (1978).

The Grand Valley is a broad lowland underlain by Mancos Shale and stretching from near Montrose, Colorado to Price, Utah. The floor of Grand Valley is ubiquitously characterized by multileveled pediments and/or terraces veneered with thin Pleistocene gravels. Within the study area, the Book Cliffs, Grand Mesa, West Elk Mountains, Black Canyon uplift, and San Juan Mountains form the northeastern boundary of the valley and the Uncompahgre Plateau gently rises from the southwestern edge of the valley. Locally the valley is the site of master drainage lines and associated glacial moraines and terraces; in other places only ephemeral drainage channels and associated pediments characterize the valley floor.

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Recommended Citation:

  1. Sinnock, Scott, 1981, Glacial moraines, terraces and pediments of Grand Valley, western Colorado, in: Western slope Colorado--western Colorado and eastern Utah, Epis, Rudy C.; Callender, Jonathan F., New Mexico Geological Society, Guidebook, 32nd Field Conference, pp. 113-120.

[see guidebook]