Terra Preta, or Amazonian Dark Earth(s), is human-created, organic-rich soil, formed from food waste, animal bone, human excrement, ash and charcoal from fires, and other waste materials. Sort of a super-compost heap (or midden), Terra Preta was created out of the infertile soils of the Amazonian rainforest, beginning at least as long ago as 4,800 years.
...Source: http://archaeology.about.com/b/2011/07/18/terra-preta.htm
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