Abstract

Average rates of denudation over periods ranging from 11 800 years to 12 800 years at sites on Mont St. Hilaire, Quebec were estimated as follows:graphicThe rates of fluvial denudation at Mont St. Hilaire are lower by a factor of one-half than published short term fluvial denudation rates in areas of similar relief and climate. The rates of free face retreat at Mont St. Hilaire are similar to the lowest rates recorded in Spitsbergen, northern Sweden, and in the Yukon Territory.The polygenetic geomorphic history of Mont St. Hilaire and the low rates of denudation estimated in this study together indicate that existing slope and valley forms cannot be explained adequately by the present processes operating at the observed rates.Talus accumulation has obscured some Pleistocene features but other processes have not.

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