Archaeologists studying a mysterious stone fragment have made a startling discovery: the markings on the slab can be used to help them find other sites used by ancient humans, making it one of the oldest known maps of a territory.
A piece of rock with mysterious markings that lay largely unstudied for 4,000 years is now being hailed as a "treasure map" for archaeologists, who are using it to hunt for ancient sites around north-western France.
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