Accession Number:

ADA034008

Title:

Episodic Erosion: A Modification of the Geomorphic Cycle,

Descriptive Note:

Corporate Author:

COLORADO STATE UNIV FORT COLLINS DEPT OF EARTH RESOURCES

Personal Author(s):

Report Date:

1976-11-01

Pagination or Media Count:

9.0

Abstract:

Most models of geomorphic evolution are oversimplified and, therefore, they are unsatisfactory for short-term interpretation of landform change. For example, the extrapolation of average denudation rates from a 10-year record to longer periods of geologic time is based on the assumption of progressive erosional evolution which even without the influence of climate change and diastrophism is probably not correct. In fact, the inherent workings of a fluvial system may prevent progressive reduction of a valley floor. It is proposed that stream gradients and valley floor altitudes do not change progressively through geologic time, but rather relatively brief periods of instability and incision are separated by long periods of relative stability grade. Although the climatic and diastrophic history of the Quaternary prevents the identification of unstable periods due to geomorphic controls alone, some field and experimental evidence indicates that such a model is possible. Therefore, a very complex denudational history of a landscape may be geomorphically normal. Author

Subject Categories:

  • Geology, Geochemistry and Mineralogy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE