Geological analysis reveals widespread ocean anoxia across low and high paleolatitudes during the Late Permian, suggesting oxygen depletion drove the mass extinction across marine shelf depths.
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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Wignall et al. (1996) studied this question.
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