Known as the Nichoria bone, the blackened fossil is part of the thigh bone of an immense extinct mammal that roamed southern Greece perhaps a million years ago. The bone was collected by ancient Greeks and may have even helped inspire certain beasts in Greek classical mythology. It was then rediscovered 40 years ago.

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"Most likely, the ancient Greeks found the bone in the lignite deposits of the Megalopolis basin, known in antiquity as the 'Battleground of the Giants.' There, the dense concentration of large fossil bones inspired the belief that entire armies of giants were blasted by Zeus's thunderbolts," Mayor told Discovery News.

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Identified in 1978 as the femur of a "Pliocene elephant," the bone was lost for two decades. Rediscovered in 1998 in the Archaeometry Laboratory of the University of Minnesota, Duluth, it remained uncatalogued until Mayor recognized its significance.

Prehistoric Fossil May Have Inspired Greek Myths