“We’re starting to piece together the puzzle of the Amazon Basin’s human history, and what we’re finding in Amapá is absolutely fascinating,” said Mariana Cabral, an archaeologist at the Federal University of Minas Gerais, who together with her husband, João Saldanha, also an archaeologist, has studied the Rego Grande site for the last decade.

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In what is now the sparsely populated state of Amapá in northern Brazil, the sun stones found by Mr. da Silva near a stream called the Rego Grande are yielding clues about how indigenous peoples in the Amazon may have been far more sophisticated than assumed by archaeologists in the 20th century.

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https://www.nytimes.com/2016/12/14/world/americas/brazil-amazon-megaliths-stonehenge.html