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Holocene Glacier Fluctuations in the Middle Canadian Rocky Mountains

Published online by Cambridge University Press:  20 January 2017

B. H. Luckman
Affiliation:
Department of Geography, University of Western Ontario, London, Ontario N6A 5C2
G. D. Osborn
Affiliation:
Department of Geology, University of Calgary, Calgary, Alberta T2N 1N4 Australia

Abstract

Holocene glacial advances in the Banff–Jasper–Yoho area of the Canadian Rocky Mountains have been extremely limited in extent. Limiting 14C dates from two sites within 1 km of contemporary glaciers of fresh terminal moraines indicate that the late Wisconsin Ice Sheet and valley glaciers disappeared prior to 9660 yr B.P. Two subsequent glacial advances are recognized. The earlier Crowfoot Advance is represented by moraines and rock-glacier deposits overlain by Mazama ash (6600 yr B.P.) and is therefore early Holocene or possibly late Wisconsin in age. The late Neoglacial Cavell Advance of the last few centuries is dated by dendrochronology and lichenometry. In addition, there is fragmentary, undated evidence of intermediate-age advance(s), mainly from rock-glacier deposits. All these advances were of limited extent (1–2 km beyond present ice margins) and the Cavell Advance was usually the most extensive. Major exceptions to this pattern occur only where rock glaciers or extensive ice-cored moraines developed during the earlier advance(s?). These deposits were not overrun by glaciers during the Cavell Advance because of their relatively greater downvalley extent and the physical barrier they presented to subsequent glacial advances. Earlier work which postulated more extensive early Holocene advances in the Canadian Rocky Mountains is shown to have inadequate dating control: Many of the features previously attributed to older Holocene events are late Wisconsin in age.

Type
Original Articles
Copyright
University of Washington

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