Steven Dutch, Professor Emeritus, Natural and Applied Sciences, University of Wisconsin - Green Bay
Based on maps in Geology and Economic Minerals of Canada, Geological Survey of Canada Economic Geology Report 1, 1970, pp. 714-725, modified from other sources.
Dark blue: Exposed water
Light blue: Present water bodies covered by ice
Yellow: Exposed land in the United States
Pink: Exposed land in Canada
Dark Purple: Marine inundation
Light Purple: Present water bodies inundated by the sea
Lake outlets are shown as thick blue lines with red arrows showing drainage direction
This list shows available maps. Figures are in years before present
An animation of the map series is shown below.
Created 12 Sept 1997, Last Update 13 September 2018