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The Permian–Triassic Boundary event at 252.2 Ma marks the largest extinction of marine fauna in the Phanerozoic and there is a wide consensus that the extinction coincided with an intense oceanic anoxic event. The stratotype of the Changhsingian Stage, precisely constrained by the PTB Global Stratotype Section and Point (GSSP) and the GSSP for the Wuchiapingian–Changhsingian Boundary, both at Meishan...
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