If anyone is interested in seeing some neat artwork by a pre-Columbian era society, near the Tapajós river mentioned in the article, type "marajoara art" into Google Images. The same type of art is still being made in and around the capital city of Belém, specifically in the neighorhood of Icoaraci, in case anyone is traveling there.

https://en.wikipedia.org/wiki/Marajoara_culture