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- {{short description|Paleoproterozoic surge in atmospheric oxygen}} ...go (2.4 [[Year#SI prefix multipliers|Ga]]) to 2.1–2.0 Ga during the [[Paleoproterozoic]] era.<ref name="Lyons 307–315">{{Cite journal |last1=Lyons |first1=Timothy ...38 KB (5,237 words) - 01:02, 25 September 2024