Rock failure
Introduction
The photograph on this page of Rock failure by Jonathan Wilkins as part of the Geograph project.
The Geograph project started in 2005 with the aim of publishing, organising and preserving representative images for every square kilometre of Great Britain, Ireland and the Isle of Man.
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Image: © Jonathan Wilkins Taken: 21 Sep 2020
The craggy eminence of Gareg Bengam shows how rock masses can fail when there are inclined slip surfaces present as a consequence of bedding or jointing. Large blocks that were prised loose by frost action have simply slid off the planar joint surface and crashed to the ground. It is quite possible that this happened in early post-glacial times when ice melted that would otherwise have buttressed the crag.