Hundreds of Mysterious Ancient Earthworks Found In the Amazon

Posted by on February 8, 2017 in Mysteries, Reality's Edge with 0 Comments

By Melissa Breyer | Treehugger

Deforestation has revealed the large geometrical geoglyphs built over 2,000 years ago – their discovery holds valuable lessons for today.

The Amazon rainforest is so rich, so dense with trees, that the forest floor is constantly in the dark. The vegetation hides many things, from isolated indigenous communities who have yet to have contact with the outside world to, as has just been discovered, massive earthworks built over 2,000 years ago.


The ditched enclosures, in Acre state in the western Brazilian Amazon, were discovered during research by Jennifer Watling, currently a post-doctoral researcher at the Museum of Archaeology and Ethnography, University of São Paulo. Hidden for centuries by trees, modern deforestation revealed the 450+ large geometrical geoglyphs.

The earthworks are spread out over roughly 5,000 square miles. And what they were used for is not entirely understood. Few artifacts were found during excavation, leading experts to discount the idea that they could have been villages. Their layout doesn’t indicate they would have been used for defense. They were likely only used on occasion, maybe as ritual gathering spots – but no one can say for sure.

Amazon geoglyphs

© Jenny Watling

But perhaps even more fascinating is that the discovery flies in the face of the idea that the rainforest ecosystem has previously been untouched by mankind.

“The fact that these sites lay hidden for centuries beneath mature rainforest really challenges the idea that Amazonian forests are ‘pristine ecosystems’,” says Watling.

“We immediately wanted to know whether the region was already forested when the geoglyphs were built, and to what extent people impacted the landscape to build these earthworks.”

With a lot of patience as well as state-of-the-art methods, the research team reconstructed 6,000 years of vegetation and fire history around two of the sites. According to University of Exeter, where Watling was earning her PhD during the research, the team found that humans strongly altered bamboo forests for millennia and small, temporary clearings were made to build the geoglyphs:

Instead of burning large tracts of forest – either for geoglyph construction or agricultural practices – people transformed their environment by concentrating on economically valuable tree species such as palms, creating a kind of ‘prehistoric supermarket’ of useful forest products. The team found tantalizing evidence to suggest that the biodiversity of some of Acre’s remaining forests may have a strong legacy of these ancient ‘agroforestry’ practices.

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