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Nipissing Great Lakes
Nipissing Great Lakes was a prehistoric proglacial lake. Parts of the former lake are now Lake Superior, Lake Huron, Georgian Bay and Lake Michigan. It formed about 7,500 years before present (YBP). The lake occupied the depression left by the Labradorian Glacier.〔University of Wisconsin, Green Bay, Dept of Geology〕 This body of water drained eastward from Georgian Bay to the Ottawa valley. This was a period of isostatic rebound raising the outlet over time, until it opened the outlet through the St. Clair valley.〔Publication 9. Geological Series 7; Surface Geology and Agricultural Conditions of the Southern Peninsula of Michigan; Frank Leverett with a Chapter on Climate by C. F. Schneider;Michigan Geological and Biological Survey Lansing Michigan; 1911〕
==Origin==
The Lake formed from the aggregation of Glacial Lakes Houghton, Chippewa and Hough, and Stanley as water levels increased. Levels returned and Lake Chippewa again flowed through the canyon at Mackinac until around 7,500 YBP. At that time, the waters in the Michigan basin, Huron basin, and the Superior basin created a single lake encompassing all three of the upper Great Lakes.〔 The lowlands through the rapids of Sault Ste. Marie and across the Upper Peninsula of Michigan were open bodies of water.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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