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Nature 442, 873-874 (24 August 2006) | doi:10.1038/442873a; Published online 23 August 2006

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L. Paul Knauth1

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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.

Newly embraced scientific paradigms usually have their share of lingering critics, quiet sceptics and bewildered agnostics. Nevertheless, few doubt the recently established consensus that Earth's atmosphere was completely oxygen-free before a great oxygenation event 2.

  1. L. Paul Knauth is in the School of Earth and Space Exploration, Arizona State University, Tempe, Arizona 85287-1404, USA.
    Email: knauth@asu.edu

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