Enhanced formation of clay in marine sediments in the lead up to the end-Permian mass extinction likely pulled the Earth back into a hot, high-CO2 state similar to that of the Precambrian.
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Jurikova, H. Reversing Earth’s carbon engine. Nat. Geosci. 15, 756–757 (2022). https://doi.org/10.1038/s41561-022-01031-z
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DOI: https://doi.org/10.1038/s41561-022-01031-z