Geological map of Britain & Ireland made from the actual rocks that make up the British Isles at the Bill Bryson Library, Durham University http://pic.twitter.com/1lYNjYqy95
— tectonictweets (@tectonictweets) January 24, 2017
via Twitter https://twitter.com/tectonictweets
January 24, 2017 at 09:15PM
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