Observation on the distribution of the redox sensitive element U in the P/Tr boundary sequence, as well as the shape of the Th/U curve suggest that oceanic anoxia was typical of the Upper Permian and ...that the transition to oxygenated conditions occured at the P/Tr boudary. The oxic event at the P/Tr transition is coincidental with the terminal phase of the Upper Permian marine regression. The shape of the Th/U curve indicates that the redox environmental conditions changed in the earliest Triassic, again resulting in oxygen deficient conditions.
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