Evolution of the Great Lakes

Based on maps in Geology and Economic Minerals of Canada, Geological Survey of Canada Economic Geology Report 1, 1970, pp. 714-725

This list shows available maps. Figures are in years before present

14500 14000 13600 13200 12900 12700 12500 12200 12000 11800 11500 11200
10900 10600 10300 10000 09500 09000 08700 08400 08200 08100 07500 06000


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Last Update 12 Sept 1997