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Two floods of extreme magnitude occurred in the Wabash Valley during late Wisconsinan time. The First flood occurred when meltwater that was stored in disintegrating ice to the north was rapidly released into the valley at a point near Delphi Indiana. During the period of gradually increasing flow, a coarsening- and thickening-upward sequence was deposited, and at peak flow, crossbedded cobble gravels accumulated in sets as much as 5 m thick. Trough crossbeds were deposited along narrow reaches of the valley where flow depths and velocities were greatest. Along wider reaches, however, where velocities and depths were less, tabular and...

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