CGRG Bibliography of Canadian Geomorphology
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Author : Delage, M.; and Gangloff, P.
Date : 1993
Title : Relict iceberg marks near Montreal, Quebec
Publication : Geographie physique et Quaternaire
Issue : 47(1):
Page(s) : 69-80
Abstract
Relict iceberg marks near Montreal, Quebec. About 60 km southwest of Montreal long narrow scours, from a few hundred metres to more than a kilometre long, most of them perfectly straight, are the result of drifting icebergs scouring the Champlain Sea bottom. The scours are roughly parallel to the St. Lawrence Valley. Icebergs could have originated from the northeast, that is north of Trois-Rivieres, where the glacier was still calving in the Champlain Sea by 10,500 BP. If such was the case, the scours may have been made by icebergs driven by the same southwesward catabatic winds responsible for the formation of the relict dunes that occur in the central St. Lawrence Lowland. In two cases however, the morphology of the scours suggests that the winds were northeasterly, as the present active dominant wind system. Associated to the scours are closed depressions that resemble iceberg gravity craters. Only the smaller ones seem to have been formed by icebergs. The larger depressions found in swarms rather look like relict cryogenic mineral mounds. For the first time iceberg scours are described in the area formerly covered by the Champlain Sea.
Bibliography of Canadian Geomorphology