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How was Lake Superior formed?

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That geologic fire – intense volcanic activity – created the critical beginning for Lake Superior, though not for the other Great Lakes basins, formed where the ice sheets found soft, shaly sedimentary rocks laid down in shallow seas about 500 million to 350 million years ago. read more

Lake Superior empties into Lake Huron via the St. Marys River and the Soo Locks. Lake Superior is the largest freshwater lake in the world in area (if Lakes Michigan and Huron are taken separately; see Lake Michigan–Huron), and the third largest in volume, behind Lake Baikal in Siberia and Lake Tanganyika in East Africa. read more

Lake Superior's basin was formed over one billion years ago by tectonic forces. Lava escaped around the edges of a large caldera or plateau, causing it to collapse and form a basin that solidified over time. read more

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Ice already formed on three of Michigan's Great Lakes a ...
Source: dailymail.co.uk

Further Research

Lake Superior Agate
www.geologypage.com

Lake Superior and Keweenawan Rift
academic.emporia.edu

Minnesota Sea Grant
www.seagrant.umn.edu

The Geology of Lake Superior
www.bobscabinsonlakesuperior.com