The Paleozoic era's Silurian period saw animals and plants finally emerge on land. But first there was a period of biological regrouping following the disastrous climax to the Ordovician.
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The Silurian Hypothesis Suggests An Advanced Civilization Lived On Earth Before HumansSo far, so not science. However, in 2018 two University of Cambridge scientists named their paper The Silurian hypothesis: would it be possible to detect an industrial civilization in the ...
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