Proof that purported fossils of early life are truly old and biological is often controversial. Detailed analyses confirm the early evolution of microbial sulphur cycling and reveal microfossils in 3.4-billion-year-old beach sandstones.
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Javaux, E. Microfossils from early Earth. Nature Geosci 4, 663–665 (2011). https://doi.org/10.1038/ngeo1279
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DOI: https://doi.org/10.1038/ngeo1279
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