Tracing the stepwise oxygenation of the Proterozoic ocean

@article{Scott2008TracingTS,
  title={Tracing the stepwise oxygenation of the Proterozoic ocean},
  author={C. Scott and T. Lyons and A. Bekker and Y. Shen and S. Poulton and X. Chu and A. Anbar},
  journal={Nature},
  year={2008},
  volume={452},
  pages={456-459}
}
Biogeochemical signatures preserved in ancient sedimentary rocks provide clues to the nature and timing of the oxygenation of the Earth’s atmosphere. Geochemical data suggest that oxygenation proceeded in two broad steps near the beginning and end of the Proterozoic eon (2,500 to 542 million years ago). The oxidation state of the Proterozoic ocean between these two steps and the timing of deep-ocean oxygenation have important implications for the evolutionary course of life on Earth but remain… Expand
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