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to the left and Arthur's Seat to the right, with their tails sloping east to the right.]] A crag (sometimes spelled '''cragg''', or in Scotland '''craig''') is a rocky hill or mountain, generally isolated from other high ground. Crags are formed when a Glacier or ice-sheet passes over an area that contains a particularly resilient chunk of rock (often a Granite Plug or some Volcanic structure). The force of the glacier erodes the surrounding softer material, leaving the rocky block protruding from the surrounding terrain. Frequently the crag serves as a partial shelter to softer material in the wake of the glacier, which remains as a gradual fan or ridge forming a tapered ramp (called the '''tail''') up the leeward side of the crag. In older examples, or those which are latterly surrounded by the sea, the tail is often missing, having been removed by post-glacial erosion. Examples of such ''crag and tail'' formations include:
Similar formations to the Crag and Tail are: |
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