In its smaller manifestation, this class of folding passes into "crumpling" or "puckering," where quite a large number of folds may be crowded into a single hand specimen.
- The Himalaya have been formed by violent crumpling of the earth's crust along the southern margin of the great tableland of Central Asia.
Outside the arc of the mountain chain no sign of this crumpling is to be detected except in the Salt Range, and the Peninsula of India has been entirely free from folding of any importance since early Palaeozoic times, if not since the Archean period itself.
Upon this fault the mountains were pushed forward over the beds deposited at their base, crumpling and folding them in the process, and forming a sub-Himalayan ridge in front of the main chain.
If a circular disk is wrought into a hemisphere and the attempt is made to hammer the edges round, crumpling must occur.