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anoxia(3)
extinction(2)
iron speciation(2)
trace elements(2)
antarctica(1)
end-permian mass extinction(1)
euxinia(1)
glauconite(1)
marine productivity(1)
nitrogen isotope of kerogen(1)
panthalassic(1)
permian(1)
permian-triassic boundary(1)
seymour island(1)
shangsi(1)
upwelling(1)