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Erie Plain
The Erie Plain is a lacustrine plain that borders Lake Erie in North America. From Buffalo, New York to Cleveland, Ohio, it is quite narrow (at best only a few miles/kilometers wide), but broadens considerably from Cleveland around Lake Erie to Southern Ontario, where it forms most of the Ontario peninsula. The Erie Plain was used in the United States as a natural gateway to the North American interior, and in both the United States and Canada the plain is heavily populated and provide very fertile agricultural land. ==Creation of the plain==
The Erie Plain is a lacustrine plain, which means it consists largely of sediment laid down by a series of proglacial lakes. These existed in the late Pleistocene era, about 25,000 years ago to about 11,700 years ago, and were created by glaciers of the Wisconsin glaciation (the last ice age). This sediment was laid atop the Chagrin Shale and the Cleveland Shale, shales created in the late Devonian period (382.5 to 359 million years ago), as well as early Carboniferous period shale in and west of Cleveland (laid down 359 to 346 million years ago). West of Sandusky, Ohio, these sediments lie atop limestone laid down in the Silurian and Devonian periods. Due to its lacustrine origin, much of the soil that comprises the Erie Plain is heavy with clay, although in some areas it is quiet sandy where ancient beaches formed. Beneath this relatively thin layer of soil is unconsolidated moraine, soil and rock left behind as the glaciers retreated.
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「Erie Plain」の詳細全文を読む
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