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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U.S. Department of the Interior
U.S. Geological Survey
This page is <URL: https://pubs.usgs.gov/gip/i81/>
Maintained by: Publications Services
Last modified 4 May 2000

For more information about this report contact Sandra Clark at shbclark@usgs.gov