What may be the oldest fragments of the modern human genome found yet have now been revealed — DNA from the 7,000-year-old bones of two cavemen unearthed in Spain, researchers say.

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The skeletons of two young adult males were discovered by chance in 2006 by cave explorers in a cavern high in the Cantabrian mountain range, whose main entrance is found at 4,920 feet (1,500 meters) altitude. Winters there are notably cold, which helped preserve the DNA in the bones. These bones date back to the Mesolithic period, before agriculture spread to the Iberian Peninsula with Neolithic settlers from the Middle East. These cavemen were hunter-gatherers, judging by the ornament that one was found with of red-deer canines embroidered onto a cloth.

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Analyses revealed that current populations of the Iberian Peninsula, which includes Spain, Portugal and Andorra, are not genetically linked with these ancient hunter-gatherers. Instead, these cavemen were closer genetically to the current populations of northern Europe.

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The researchers now aim to complete the genomes of both cavemen. Such data could help "explore genes that have been modified with the arrival of the Neolithic in the European populations," Lalueza-Fox said.

Caveman Bones, 7,000 Years Old, Said To Yield Oldest DNA Of Modern Humans