Exfoliation accounts partly for the rounding of many summits in the highlands.
One example is on Popolopen Torne. Crescentic gouges that occur when forck graments embedded in Pleistocene glacier ice move over a bedrock surface fracturing the bedrock to a depth of several inches are abundant on Popolopen Torne's north side. They are convex toward the southeast, the direction of ice movement. Irregularities and grouping here are typical. The property is on land now owned by West Point.