Description: A map from 1911 showing the early drainage history of the southern Great Lake district during the last glacial period. The map indicates the present lake shorelines (dashed line) and shows the progression of the retreat of the ice lobes and the expansion of the proglacial lakes, including Lake Chicago, Lake Saginaw, and Lake Whittlesey. The map shows rivers and the great glacial lobes with direction of flow of the Saginaw lobe, Huron lobe, and the Ontario lobe.
Place Names: Midwest States,
ISO Topic Categories: boundaries,
geoscientificInformation,
inlandWaters,
location
Keywords: Drainage History of the Southern Great Lake District, physical, kGlacial, physical features, boundaries,
geoscientificInformation,
inlandWaters,
location, Unknown, Ice Age
Source: Isaiah Bowman, Ph. D, Forest Physiography (New York, NY: John Wiley and Sons, 1911) 479
Map Credit: Courtesy the private collection of Roy Winkelman |
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