Oceanic Anoxia and the End Permian Mass Extinction

@article{Wignall1996OceanicAA,
  title={Oceanic Anoxia and the End Permian Mass Extinction},
  author={Paul B. Wignall and Richard J. Twitchett},
  journal={Science},
  year={1996},
  volume={272},
  pages={1155 - 1158}
}
Data on rocks from Spitsbergen and the equatorial sections of Italy and Slovenia indicate that the world's oceans became anoxic at both low and high paleolatitudes in the Late Permian. Such conditions may have been responsible for the mass extinction at this time. This event affected a wide range of shelf depths and extended into shallow water well above the storm wave base. 
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References

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