The geometric earthwork structures, carved into the ground with embankments and ditches, are in some cases more than 2,500 years old, researchers said.
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Archaeologists Find Hundreds of Ancient Glyphs in the Amazon
The geometric earthwork structures, carved into the ground with embankments and ditches, are in some cases more than 2,500 years old, researchers said. Source: Read the original article on www.nytimes.com
