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Lake Saginaw : ウィキペディア英語版 | Lake Saginaw
Lake Saginaw occupied the basin of Saginaw Bay. There were two periods when it was an independent lake, not associated with a larger body of water in the Huron basin. The first Lake Saginaw was a contemporary of the last stages of Lake Maumee. When the ice border opened allowing these two lakes to become one, it entered the period of Lake Arkona. Then, the ice advanced, closing the link forming the second Lake Saginaw. This was during the time of Lake Whittlesey. When the ice margin retreated northward for the last time, it became the western by of Lake Wayne and then of Lake Warren and Lake Lundy.〔Chapter XV, Glacial Lake Saginaw; Frank B. Taylor; The Pleistocene of Indiana and Michigan, History of the Great Lakes; Monographs of the United States Geological Survey, Vol LIII; Frank Leverett and Frank B. Taylor; Washington, D.C,; Government Printing Office; 1915〕 During its periods as an independent lake, its outlet was west through Grand River channel.〔 ==First Lake Saginaw== Lake Saginaw began after the building of the Flint moraine and the creation of the Imlay channel (from Flint to Maple Rapids) from glacial runoff.〔 When the ice sheet had retreated into the Saginaw basin, exposing land, water began to accumulate and the First Lake Saginaw was formed.〔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〕 The outlet of the lake was through Grand River to Lake Chicago, which as served the run-off from the glacier. Well-defined beaches surround the outlet at an altitude above sea level,〔 To the north and west, they are higher because of isostatic rebound once the glaciers weight had been removed. The bed of the lake is nearly equally divided between a sandy and a clayey soil. Sand due to lake waves and currents is restricted to the border of the lake, while glacial outwash may be present where there was a considerable depth of water,〔
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Lake Saginaw」の詳細全文を読む
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