April 29, 2011April 27, 2011Portland rock strata Part 1 Continue reading "Portland rock strata Part 1"
April 7, 2011October 22, 2013Portland rocks – geological abstract art Continue reading "Portland rocks – geological abstract art"
March 26, 2011September 7, 2011Rocks on Rhossili Down – Part 1 Continue reading "Rocks on Rhossili Down – Part 1"
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