Fluctuations in Precambrian atmospheric oxygenation recorded by chromium isotopes

@article{Frei2009FluctuationsIP,
  title={Fluctuations in Precambrian atmospheric oxygenation recorded by chromium isotopes},
  author={Robert Frei and Claudio Gaucher and Simon W. Poulton and Donald E. Canfield},
  journal={Nature},
  year={2009},
  volume={461},
  pages={250-253}
}
Geochemical data suggest that oxygenation of the Earth’s atmosphere occurred in two broad steps. The first rise in atmospheric oxygen is thought to have occurred between ∼2.45 and 2.2 Gyr ago, leading to a significant increase in atmospheric oxygen concentrations and concomitant oxygenation of the shallow surface ocean. The second increase in atmospheric oxygen appears to have taken place in distinct stages during the late Neoproterozoic era (∼800–542 Myr ago), ultimately leading to oxygenation… 
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