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Nature 455, 1051-1052 (23 October 2008) | doi:10.1038/4551051a; Published online 22 October 2008

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Biogeochemistry: Life before the rise of oxygen

Woodward W. Fischer1

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The discovery of molecular fossils in 2.7-billion-year-old rocks prompted a re-evaluation of microbial evolution, and of the advent of photosynthesis and rise of atmospheric oxygen. That discovery now comes into question.

Go back to Archaean time, the interval of Earth's history between about 4 billion and 2.5 billion years ago, and we're in largely unknown biological territory.

  1. Woodward W. Fischer is in the Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125, USA.
    Email: wfischer@caltech.edu

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