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A comment on Egypt's Pyramids May Have Been Built on a Long-Lost Branch of the Nile. Parent comment

Re:Egypt's Pyramids May Have Been Built on a Long-Lost Branc... by noslenwerdna on Thursday May 16, 2024 @02:22PM (#40381526)
But there are other chemicals that a civilization might produce that are also visible in the geological record. Fertilizers would also leave a mark.
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Re:Egypt's Pyramids May Have Been Built on a Long-Lost Branc... by stuxnet on Thursday May 16, 2024 @02:46PM (#40381766)
https://en.wikipedia.org/wiki/Terra_preta

> Terra preta soils are found mainly in the Brazilian Amazon, where Sombroek et al. estimate that they cover at least 0.1–0.3%, or 6,300 to 18,900 square kilometres (2,400 to 7,300 sq mi) of low forested Amazonia; but others estimate this surface at 10.0% or more (twice the area of Great Britain).

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