riegel A rock bar that extends across the floor of a glacial trough. It may be caused by a local reduction in the erosive ability of a valley glacier or by a local increase in bedrock strength, perhaps due to a reduction in joint density. It may alternate with a rock basin to give an irregular long profile.

riegel A rock bar that extends across the floor of a glacial trough. It may be caused by a local reduction in the erosive ability of a valley glacier or by a local increase in bedrock strength, perhaps owing to a reduction in joint density. It may alternate with a rock basin to give an irregular long profile.