CGRG Bibliography of Canadian Geomorphology
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Author : Broster, B.E.; and Dreimanis, A
Date : 1981
Title : Deposition of multiple lodgement tills by competing glacier flows in a common ice sheet
Publication : Arctic and Alpine Research.
Issue : 13(2):
Page(s) : 197-204
Abstract
Multiple till layers were exposed in excavations along the east side of the Peavine Valley, British Columbia, adjacent to the southern Rocky Mountain Trench. Field and laboratory investigations along a 60-m section delineated four subunits belonging to a single lodgement till unit which grades into one till up the valley side. Examination of regional striae, till structure, and fabric, and the analyses of till matrix indicate that the subunits were formed by competing oscillating glacial flows from two different directions. Major glacial flow from Purcell Mountains in the north northwest periodically alternated with another flow from the northeast out of the Rocky Mountain Trench; both flows belonged to the Cordilleran Ice Sheet. It is postulated that similar till complexities will occur in other areas of coalescent and competing glacial flows.
Bibliography of Canadian Geomorphology