The first of two stepwise increases in atmospheric oxygen occurred at the end of the Archaean eon. Analyses of sulfur and iron isotopes in pyrite reveal a near-shore environment that hosted locally oxygenated conditions in the Mesoarchaean era.
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Gomes, M.L. An Archaean oxygen oasis. Nature Geosci 11, 84–85 (2018). https://doi.org/10.1038/s41561-018-0058-z