What was Earth's atmosphere like at different times in the past? Studies of sulphate-rich rocks, which are found to contain an unusual oxygen-isotope signature derived from chemical interactions in the atmosphere, may provide a new tool to tackle the question.
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Clayton, R. Rock signature from the sky. Nature 406, 136–137 (2000). https://doi.org/10.1038/35018193
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DOI: https://doi.org/10.1038/35018193
