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DescriptionDiagram showing historical levels of Lake Superior.jpg
English: Diagram showing effect of glaciation and post-glaciation unloading on the height of Lake Superior above sea level.
Source
From:
POST-VALDERS LAKE STAGES IN THE LAKE SUPERIOR BASIN
Geological Survey Professional Paper 754-A
Glacial and Postglacial Geologic History of Isle Royale National Park, Michigan
United States Geological Survey
Diagram showing effect of glaciation and post-glaciation unloading on the height of Lake Superior above sea level. From [http://www.cr.nps.gov/history/online_books/754a/sec6.htm]. {{PD-USGov-Interior-USGS}}