Mysterious earthen rings predate Amazon rainforest

July 7, 2014 9:36 PM

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Mysterious earthen rings predate Amazon rainforest

A series of square, straight and ringlike ditches scattered throughout the Bolivian and Brazilian Amazon were there before the rainforest existed, a new study finds.

These human-made structures remain a mystery: They may have been used for defense, drainage, or perhaps ceremonial or religious reasons. But the new research addresses another burning question: whether and how much prehistoric people altered the landscape in the Amazon before the arrival of European...

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