Pebbles RBGPSW 4-6 Pebbles of different colours, textures, patterns and rock types as seen on the upper shore at the Llangennith end of Rhossili Bay in Gower, South Wales, October 2014. The pebble with holes, in the centre of the last picture (6), mostly shows the remains of burrows that had been made by small marine worms but also one large one made by a marine bivalve mollusc. Photos from the archive.

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