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"The whole north western corner of Ardnamurchan is a large "Caldera" which is a crater left behind by a collapsed volcano and makes Ardnamurchan popular with geologists where the tapping of geology hammers to obtain samples can often be heard in the summer months."
Well, you could describe it that way, if you hadn't read any work on the area published in the last 30 or so years. It's a volcanic complex, that's for sure, but claiming that it is the substructure of a caldera (or as described in decades gone by, a "cauldron subsidence", which is not quite the same thing) is considerably more contentious. I'll edit appropriately.
The tinkle of hammer on rock is not so common - as a geologist, I didn't even take my hammer on my recent visit. I don't know the precise status of the peninsula, but it's quite likely to be in some degrees a geological conservation zone. I figured that any samples that were worth taking would be available from loose debris in a quarry, or as stones on the shore. The area is popular for student training, but such training these days involves geoconservation as well as rock identification. Aidan Karley, FGS 13:31, 17 January 2009 (UTC)