Document type: DU ETD
Collection: Geology Theses  
 
Title Pediments of the Colorado Piedmont A Geomorphic Study
Author(s) Howard, William Arby
School/Department Department of Geography
Institution University of Denver
Degree Type Master's
Degree Name M.A.
Type of Resource text
Degree Date 1960-6
Digital Origin reformatted digital
Rights Statement All Rights Reserved
Reason for Restrictions No restrictions
Type of Restriction No restrictions
Keyword(s) Geology
Geography
Abstract This study was concerned with the identification and origin of certain planata rock surfaces found at varying elevations along the foothills zone of the Colorado front Range. The surfaces are unusual in appearance when compared with the more angular features of the foothills and seemingly are not related to the present cycle of erosion. The postulate was proposed by this author that the surfaces were features which had originated during a previous geomorphic cycle. Comparing the essential characteristics of the planate surfaces to the characteristics of quite similar features described in other localities it was adjudged that the surfaces along tho Front Range conform to the necessary requirements to be identified as pediments. Pediments are landforms which are common in arid and semi-arid climatic regions. As examination of the physiographic development of the Front Range revealed that there have been periods in the past when the foothills streams were concentrating their efforts toward the lateral reduction of the mountain mass. For this to have occurred the streams of the area would have to have undergone a Strange metamorphosis. The condition necessary for a stream to cease cutting downward and to concentrate its efforts toward the lateral corrosion of its channel is known as the attainment of a profile of equilibrium or grade. Within the walls of the more active streams in the foothills rock-cut benches, which are quite noticeable, testify to past periods in which the streams were engaged in lateral cutting of the mountains. A comparison of the relative elevations of these remnants and the pediment surfaces indicates a definite relationship in their genetic origin. Thus the conclusion was reached that the pediments, as well as the rock-cut benches, along the foothills are the result of graded streams which were concentrating what tooling actions they possessed toward the lateral reduction of the mountain front.
Handle http://hdl.handle.net/10176/codu:37747
 
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Created: Thu, 25 Mar 2010, 16:32:40 UTC by Rachel Desormes . Detailed History