The carvings stretch out in circles and squares that can be as big as a city block, with trenches up to 12 yards wide and 13 feet deep.
They appear to have been built up to 2,000 years ago. For centuries, the enigmatic structures remained hidden to all but a few archaeologists.
The presence of just a few artifacts, and the layout of the earthworks, suggest they weren’t used as ancient villages or for military defenses.
They were likely built for rituals, some archaeologists suspect. Watling and her colleagues found that in contrast with the large-scale deforestation we see today — which threatens about 20 percent of the largest rain forest in the world — ancient indigenous people of the Amazon practiced something more akin to what we now call agroforestry.
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Zuckerberg said, in an apparent jab at dating apps like Tinder that have a reputation for stoking casual romantic behavior.
Since the discovery, archaeological study of the earthworks and other evidence has challenged the notion that the rain forests of the Amazon were untouched by human hands before the arrival of European explorers in the 15th century.
And while the true purpose of the geoglyphs remains unknown, a study published on Monday in The Proceedings of the National Academy of Sciences offers new insight into the lives of the ancient people who lived in the Amazon.
The reaction to Facebook’s dating app was immediate.
Shares of Match Group, the company that runs Tinder and other popular dating apps such as OKCupid, plummeted more than 22 percent — the largest one-day drop in its history — after Mr. Shares of Match Group’s owner, Inter Active Corp, or IAC, dropped by almost 18 percent. Zuckerberg painted the new dating service as a natural extension of Facebook, saying that he is frequently approached by couples on the street who say they first met on the social network.“If we’re focused on helping people build meaningful relationships, this is perhaps the most meaningful of all,” he said.