Dark earths accumulate under long-term settlement

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Sustained occupation of bluffs above the major Amazonian rivers builds up deep anthropogenic soils - charcoal, bone, ceramic and organic waste - that remain fertile centuries after the settlements end. The accumulation stops abruptly, consistent with the demographic collapse that followed European contact. The soils themselves are the record; no written source describes their making.

A node is not a place. Drawing it on a map would assert something about the world that no stored fact supports.