The serpentine rocks at Kynance Cove, on the Lizard in Cornwall, are beautiful mixtures of greens and purples. Formed from an area of the mantle that lies just below the crust, they were once kms below the earth's surface. What I didn't realise is that the boundary between the crust and mantle - the Mohorovicic discontinuity (the 'Moho') is exposed on the beach at Coverack - 11 miles from Kynance cove. This will no doubt provide a good excuse for another walk! ....
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| The grey gabbro meets the red serpentine at the 'Moho' at Coverack. Photo from www.geolsoc.org.uk/GeositesKynance. |
Anyway - below are pictures of Kynance and serpentine. The felted pebbles are mine - the colours aren't perfect but they are closer in reality than this shows.
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