Abstract
The physiographic history of the Arkansas River Valley between Leadville and Canon City is recorded in a descending series of benches, pediments, and alluvial plains flanking the present river. The highest of these seem to correspond to the Rocky Mountain peneplain which has been regarded as Miocene in age. Remnants of a later "broad-valley" stage lie above the flight of seven inner terraces developed in part on Pliocene sediments. Of these, two are preglacial in age, four correspond to glacial stages, and the lowest is postglacial.
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