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Lake Warren
Lake Warren formed in the Lake Erie basin around 12,700 years before present (YBP) when Lake Whittlesey dropped in eleveation. Lake Warren is divided into three stages Warren I , Warren II and Warren III , each defined by the relative elevation above sea level.〔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== Lake Warren followed Lake Wayne. It covered the basin of Lake Erie, part of Lake Huron, including Saginaw Bay and the lowland, which separates Lake Huron from Lake Erie. It included a part of the Lake Ontario basin and the lowland between Lakes Ontario and Erie. Lake Warren included the Saginaw basin and the Huron-Erie basin. Its outlet was through the Grand River to Lake Chicago. The beach stands at above sea level west of the hinge line, unaffected by the isostatic rebound. It is marginally above the outlet, at . Lake Warren was preceded by a lower stage, which had its outlet through the Mohawk valley.〔 Lake Warren came into existence its waters were raised from Lake Wayne by advancing ice front. The ice both compacted the area where the melt water could be held, raising the water level, while blocking the lower outlet from Lake Wayne.〔Chapter XIX, Glacial Lake Warren; Frank B. Taylor; Glacial Formations and Drainage Features Erie and Ohio Basins; Chapter XIX, Glacial Lake Warren; Frank B. Taylor; Government Printing Office; Washington, D.C.; 1902; pg 741-757〕
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