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Early Earth

Cyanobacteria at work

Nature Geoscience volume 7, pages 253254 (2014) | Download Citation

Oxygen-producing photosynthesis must have evolved before the pervasive oxidation of the atmosphere around 2.4 billion years ago, but how long before is unclear. Geochemical analyses of ancient sedimentary rocks now suggest that cyanobacteria generated oxygen at least 3 billion years ago.

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Affiliations

  1. Alan J. Kaufman is in the Department of Geology, University of Maryland, College Park, Maryland 20742-4211, USA

    • Alan J. Kaufman

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Correspondence to Alan J. Kaufman.

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DOI

https://doi.org/10.1038/ngeo2128

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