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Lake Algonquin
Lake Algonquin was a proglacial lake that existed in east-central North America at the time of the last ice age. Parts of the former lake are now Lake Huron, Georgian Bay and inland portions of northern Michigan.
The lake varied in size, but it was at its biggest during the post-glacial period and gradually shrunk to the current Lake Huron and Georgian Bay. About 7,000 years ago, the lake was replaced by Lake Chippewa as the glaciers retreated and 3,000 years later by the current Lake Michigan.
==Physiography==
About 11,000 years before present, the Laurentian Glacier has retreated northward, forming a boundary across the northern edges of Lake Superior and Lake Huron. The water level was at above sea level, creating a single body of water in the three basins of Lake Michigan, Lake Huron and Lake Superior.〔Bulletin 4, The Glacial Lakes around Michigan; William R. Farrand, University of Michigan, Ann Arbor, Michigan; 1988〕 The lake drained through three outlets, the Chicago Portage, the St. Clair-Detroit River, and through the Trent Valley.〔The Illinois Ice Lobe; Frank Leverett; U.S. Geological Survey, Monograph, #38; Government Printing Office; Washington, D.C.; 1899, Plate 21〕
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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