What looked like simple red stains turned out to be Britain’s oldest cave art from 17,100 years ago

Inside a limestone cave on the Gower Peninsula in south Wales, eleven parallel horizontal lines of red pigment have been sitting on a cave wall for roughly 17,100 years. They were first noticed by scientists in 1912, declared a remarkable example of Palaeolithic cave art, then reclassified as a natural mineral seep sixteen years later, and subsequently forgotten by the academic community for nearly a century.

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