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In some areas of glacial erosion, preglacial valleys in the direction of ice sheet flow provided a "channel" for the glacial abrasion. With no obstructions and thick ice in the valley, the erosion becomes even greater through the resulting trough. If these deepened troughs are dammed with till or other material, a finger lake can form. The classic example are the Finger Lakes in central New York and many pre-alpine lakes in Europe.
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