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permian(71)
mass extinction(41)
permian-triassic boundary(39)
china(21)
triassic(20)
permian period(19)
extinction(18)
south china(16)
paleoclimate(13)
paleoenvironment(13)
end-permian mass extinction(12)
terrestrial ecosystem(12)
carboniferous(11)
anoxia(10)
biostratigraphy(10)
early permian(10)
permian-triassic transition(10)
fossil record(9)
paleogeography(9)
carbon isotope(8)
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