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Successive stages in the development of the Great Lakes

Great Lakes. Successive stages in the development of the Great Lakes, North America. a. An early stage (about 25,000 years ago) showing marginal lakes with an outlet near Chicago (C) into the Mississippi. b. The marginal ancestors of Lake Superior and Lake Michigan drain into the Mississippi. The eastern lakes drain into the Hudson River. E, Lake Erie; F, Finger Lakes od New York State; H, Lake Huron; M, Lake Michigan; S, Lake Superior. Holmes, 1953, p. 242. See also XII - 138

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