Accession Number : AD0711924

Title :   PERIGLACIAL FORMATIONS UNDER CONDITIONS OF PREDOMINANT DENUDATION.

Corporate Author : COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER N H

Report Date : 1970

Pagination or Media Count : 13

Abstract : According to our observations, frost-induced fracturing also occurs in the mountains and predetermines the existence and development of quite distinctive forms of relief. The problem of the origin of so-called mountain terraces, forms of relief peculiar to mountainous regions with severe climate, in the polar zone or in the bald-mountain zone of highlands, has been discussed in the literature for a long time. These are typical group forms of mountain slopes, forming lobe-type little terraces of several tens and hundreds of meters in diameter, situated approximately at even distances one above the other and having the same structure in cross-section. Their dimensions and form are more or less stable for each mountain slope. The structure of these terraces indicates that the process of their development is connected with the weathering of bedrocks -- crystalline or metamorphic -- of which the mountain slopes are composed. The friable cover, formed in this process, is desposited in a regular pattern; this fact, besides the other features of the structure of mountain terraces, helps to explain their origin. (Author)

Descriptors :   (*EROSION, FREEZING), (*ARCTIC REGIONS, EROSION), PERMAFROST, DEPOSITS, STRATIGRAPHY, ROCK, STRUCTURAL GEOLOGY, USSR

Subject Categories : Geology, Geochemistry and Mineralogy

Distribution Statement : APPROVED FOR PUBLIC RELEASE