Dark earths accumulate under long-term settlement

Assembled from 20 blocks · 1 evidence · 18 related

1. Story
2. 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.
3. Knowledge
4. Indigenous Peoples and Demarcated Territories of the Amazon
5. Terra Preta (Amazonian Dark Earths)
6. Dark earths accumulate under long-term settlement
7. Connections
8. Terra Preta (Amazonian Dark Earths)
9. Indigenous Peoples and Demarcated Territories of the Amazon
10. Indigenous Peoples and Demarcated Territories of the Amazon
11. Dark earths accumulate under long-term settlement
12. Brazil Nut Tree (Bertholletia excelsa)
13. Amazon Deforestation
14. Xingu Indigenous Territory
15. Terra Preta (Amazonian Dark Earths)
16. Dark earths accumulate under long-term settlement
17. Orellana descends the river to the Atlantic
18. Brazil's constitution recognises indigenous land rights as original
19. Evidence
20. Supports the finding that domesticated tree species are disproportionately abundant in the modern Amazon and that their abundance and richness increase near archaeological sites, indicating a persistent pre-Columbian human signature in present forest composition. V55 verification basis: not retrieved in this session; the magnitude of the enrichment is deliberately not quoted.