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permian(67)
mass extinction(38)
permian-triassic boundary(35)
china(21)
triassic(19)
extinction(18)
permian period(18)
south china(16)
end-permian mass extinction(12)
terrestrial ecosystem(12)
carboniferous(11)
paleoclimate(11)
anoxia(10)
biostratigraphy(10)
paleoenvironment(10)
permian-triassic transition(10)
early permian(9)
fossil record(9)
paleogeography(9)
continental stratigraphy(8)
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