Glimpses of the Ice Age from I-81
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Travelers on Interstate Highway 81 can see remnants of the Ice Age on the mountains between Strasburg and Harrisonburg, Virginia. Scattered along the miles of green, forested mountains are many gray patches without any forests. These treeless patches, or openings, in the steep mountain forests are block fields -- geologic features that owe their origin to the Ice Age.
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Last modified 4 May 2000
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