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For a century, specialists dismissed a series of parallel red lines found in a Welsh cavern as a phenomenon of nature instead of human-made rock art. A brand-new research study reveals the lines are an uncommon example of Paleolithic art– and at 17,000 years of ages, they’re the earliest example of rock art in the British Isles.

Bacon Hole is a collapse the limestone cliffs of Gower, a peninsula in southwest Wales. In 1912, a group of geologists and archaeologists discovered a panel deep within the cavern covered in a series of 11 horizontal lines.

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