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  • 138La-138Ce geochronology shows that La/Ce fractionation, and Ce oxidation, occurred at the time of deposition, placing the origin of oxygenic photosynthesis in the Mesoarchaean or earlier.

    • Laureline A. Patry
    • Pierre Bonnand
    • Stefan V. Lalonde
    Research
    Nature
    Volume: 642, P: 99-104