The Algoman Revolution was one of the great mountain-making movements of the North American continent. The results of the crustal deformation and of the invasion of the deformed crust by granitic magmas are apparent over a large proportion of the Canadian Shield, and probably extend much beyond its limits. Few students of pre-Cambrian geology today doubt the reality of the event, its magnitude, or its distinctness from the earlier Laurentian Revolution with which it was confused for many years in geological literature.

In accordance with the principles of isostasy, great crustal deformations result in important elevations of the continental areas affected, and there is every reason to believe that at the end of the Algoman Revolution the region of the Canadian shield was greatly uplifted. In the writer's report on the Lake of the Woods 1 he devoted a paragraph to the argument that because . . .

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