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Border ice forming on the Tomorrow River near Amherst. Ken Schreiber photo.

Wild Side: Rivers of ice are powerful

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The North American Laurentide ice sheet was an enormous river of ice that covered most of Canada, the Upper Midwest, New England and parts of Montana and Washington. It bulldozed our region several times, conveying sediment and rocks from the north. The most recent maximum advance was about 21,000 years ago.

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