PerspectiveOcean Science

Ironing Out Biosphere Oxidation

Science  18 Feb 2005:
Vol. 307, Issue 5712, pp. 1058-1059
DOI: 10.1126/science.1107482

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Various lines of evidence now indicate that the atmosphere became oxygen-rich about 2.3 billion years ago. In his perspective, Kump describes work by Rouxel and colleagues who used the stable isotopic composition of iron minerals to explore the environmental context of this monumental global change.