Human habitation and influence on the landscape in the Amazon seems far more extensive in scope and duration than previously thought, based on recent discoveries.

https://duckduckgo.com/?q=Amazon+mounds+archaeology&t=ffip&i...

https://duckduckgo.com/?q=Amazon+australasian+dna&t=ffip&ia=...

The significance of the second link is ancient peoples further north and in other parts of the Americas don’t share this genetic link, indicating a longer timeline of human habitation in the region than previously thought.