 Parts of the Sudetes remained free from glacier ice developing permafrost soils and periglacial landforms such as rock glaciers, nivation hollows, patterned ground, blockfields, solifluction landforms, blockstreams, tors and cryoplanation terraces.The occurrence or not of these periglacial landforms depends on altitude, the steepness and direction of slopes and the underlying rock type.Other than debris flows there is little contemporary mass wasting in the mountains.