Most geoglyphs seem to be late, dating to only a few hundred years before Columbus. The ubiquity of the geoglyphs may indicate that some type of cultural movement swept over earlier social arrangements. “But whatever was there, these societies have been completely forgotten,” said Guillermo Roja, an anthropologist who is director of sustainable development and indigenous peoples for the prefecture of the Pando. “It’s only been 400 years since they vanished,” he told me. “Why does nobody here know anything about them? They were living here for such a long time and nobody knows who they were.”
...more
