Dating the rise of atmospheric oxygen

@article{Bekker2004DatingTR,
  title={Dating the rise of atmospheric oxygen},
  author={Andrey Bekker and Heinrich Dick Holland and P.-L. Wang and Douglas Iii Rumble and Holly Stein and Judith L. Hannah and Louise Coetzee and Nicolas Beukes},
  journal={Nature},
  year={2004},
  volume={427},
  pages={117-120}
}
Several lines of geological and geochemical evidence indicate that the level of atmospheric oxygen was extremely low before 2.45 billion years (Gyr) ago, and that it had reached considerable levels by 2.22 Gyr ago. Here we present evidence that the rise of atmospheric oxygen had occurred by 2.32 Gyr ago. We found that syngenetic pyrite is present in organic-rich shales of the 2.32-Gyr-old Rooihoogte and Timeball Hill formations, South Africa. The range of the isotopic composition of sulphur in… 
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