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permian(4)
china(3)
mass extinction(3)
permian-triassic boundary(3)
south china(3)
brachiopods(2)
eastern gondwana(2)
end-permian mass extinction(2)
ichnology(2)
microfacies(2)
triassic(2)
age determination(1)
animalia(1)
bacteria clumps(1)
bedding plane(1)
benthic infauna(1)
benthonic ecosystem(1)
biodiversity(1)
biofacies(1)
biotic factor(1)
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