The markings on this pebble are entirely natural and exactly as found on the beach. Since I first found it, the white lines have remained unchanged but the dark colour of some patches has diminished with time. I have concluded that the dark patches were due to a damp surface film of microscopic algae or other micro-organism colonising those areas of the limestone with a coarser texture. These have eventually dried out and become inconspicuous.
White lines are wrapped around the pebble as if inscribed by an unknown artist, delineating curving abstract or geometrical spaces. Each angle of view reveals new aspects of the design. Pebbles with white lines and white patches on them are commonly found on the beach at Charmouth but this particular stone is astonishing in the intricacy of the markings. It is difficult to believe that the lines are natural but they are just the way I discovered them; they are a geological phenomenon and part of the petrology of the rock from which the pebble is derived.
Revision of a post first published November 2009
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