Most geologists agree that Earth's atmosphere was oxygen-free until 2.4 billion years ago. But the latest sulphur-isotope measurements from sedimentary rocks suggest otherwise.
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Knauth, L. Signature required. Nature 442, 873–874 (2006). https://doi.org/10.1038/442873a
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DOI: https://doi.org/10.1038/442873a
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