If a highly jointed layer of bedrock is on the surface, large portions of it will be picked up by the glacier and deposited later as a glacial erratic.
The valley formed in this fashion may have a steep wall at its head caused by a change in the bedrock type.
The stronger bedrock will remain in the form of a riser at the end of a hanging valley.
This may cause a very sudden drop in the valley floor at the points where the glaciers converged.
In an area where the snowline is rising, the cirque in which the glacier forms may recede.