Continuing with America before: The Key to Earth’s Lost Civilization By Graham Hancock.I love a good mystery,3 very easy chapters in this one.My guess at this moment would be that this ancient civilization in the Amazon was started by Pilgrims from Atlantis after extensive recon.Again we have the subject of the British Isles rearing it's head in the sacred geometry chapter,that points to there for possible tie in with this lost civilization.The chapter in my mind gives further credence to Beaumont's theory that the old testament took place in a location other then the middle east location the victors said it did...

...There appears—exceptionally—to be universal agreement among scientists on one point. This is that the explanation for all the useful qualities of terra preta “lies in large part with the char (or biochar) that gives the soil its darkness” and that is produced, as Tom Miles explained, by the smouldering (rather than hot burning) of organic matter in an oxygen-poor environment. The results are not properly understood, but, according to Nature, “The particles of char produced this way are somehow able to gather up nutrients and water that might otherwise be washed down below the reach of roots.”28

William Balée, professor of anthropology at Tulane University, confirms these observations, adding that “microbial activity leads to increased carbon sequestration,” and that “ADE is richer and more diverse in microbes than surrounding soils, even though millions of these species remain to be identified precisely, and literally a million separate taxa can be contained in only 10 grams of soil. A significant proportion of the microbes in ADE are different from microbes in the surrounding primeval soils.”29

Another authoritative study also focused on the surprising microbial vigor and utility for agricultural purposes of ADEs, noting a further connection with the managed use of fire. “Fire contributes charcoal and ash, which increase soil pH, thereby suppressing aluminum activity toxic to plant roots and soil microbiota.”30

What is more, fire increases the capacity of the soils to retain nutrients, thus maintaining a “synergistic cycle of continued fertility.”31
https://exploringrealhistory.blogspot.com/2020/08/part-5america-before-key-to-earths-lost.html