The Ballochmyle Petroglyphs. Known as cup-and-ring marks, these were most likely carved in the neolithic period some four to six thousand years ago. Discovered in 1986 on a rock wall near the Ballochmyle Viaduct in Ayrshire, they're the most extensive area of such carvings so far uncovered in Britain. To give you an idea of the scale, the largest of the ring marks are around 50cm across.
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