• I came here to post this:

    https://www.theguardian.com/science/2018/mar/27/lost-amazon-villages-uncovered-by-archaeologists

    I think it'll only be a matter of time before they find evidence of very large settlements, not just villages, although it's probably unlikely that there will be much that was stone-built. Then again, there may be areas in the Amazon where stone was abundant.

    And still the mystery about the causes ... epidemics/natural disasters/climate change? And when did population levels collapse or go down? Did early European expeditions introduce the pathogens that we know had such a devastating effect in Mesoamerica?

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