The pattern of white dots and stripes on the blue-grey boulder (in the foreground of the picture above) is fossilised coral which lived between 290 and 340 million years ago. This boulder is one of many with similar fossils that come from the Carboniferous Limestone strata which are a major geological component of the tip of the Gower Peninsula. The original calcareous components of the coral skeleton have been replaced by white crystals, probably calcite. The process has preserved in fine detail the internal structure of the coral with its many internal dividers or septa. The way the beach boulders have weathered and worn has exposed the coral colonies within the rocks showing the long axes or longitudinal sections of the coral (the stripes) and the circular end views or transverse sections (the dots).
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