Image: River of rocks at the Hawk Mountain, Pennsylvania 2007
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Description: The "River of Rocks" at the Hawk Mountain, Pennsylvania. According to www.hawkmountain.org, this formation is a mile-long boulder field, up to 40 feet deep, which was deposited 10,000-12,000 years ago (the end of the last ice age), when glaciers stopped 40-50 miles to the north of this location. A periglacial process cracked boulders from the ridgetop that gradually slid to their current position. The photo was taken on July 31, 2007
Title: River of rocks at the Hawk Mountain, Pennsylvania 2007
Credit: Transferred from en.wikipedia to Commons.
Author: Randy42724 at English Wikipedia
Usage Terms: Public domain
License: Public domain
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