Three forested islands in the Bolivian Amazon show evidence of human habitation about 10,000 years ago, researchers say. The islands are shell middens, piles of freshwater snail shells that humans left behind, which scientist carbon-dated. "This discovery alters the map of early human occupations in South America," said geographer Umberto Lombardo of the University of Bern in Switzerland.
Snail shell piles put ancient humans in Bolivian Amazon earlier than thought
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