: Paleoclimatology: Changhsingian

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Changhsingian

In the geologic time scale, the Changhsingian or Changxingian is the latest age or uppermost stage of the Permian. It is also the upper or latest of two subdivisions of the Lopingian Epoch or Series. The Changhsingian lasted from 254.14 to 251.9 Ma ago. It is preceded by the Wuchiapingian age/stage and is followed by the Induan age/stage (Early Triassic epoch). The greatest mass extinction in the Phanerozoic eon, the Permian–Triassic extinction event, occurred around the end of this age. The Changhsingian is named after Changxing in northern Zhejiang, China. The base of the Changhsingian Stage is at the first appearance of the conodont species Clarkina wangi. The global reference profile is profile D at Meishan, in the type area in Changxing, just below the Changhsingian foraminifer index fossil Palaeofusulina and the first appearance of the ammonoid Tapashanites. The top of the Changhsingian (the base of the Induan Stage and the Triassic System is at the first appearance of the conodont species Hindeodus parvus. The Changhsingian ended with the Permian–Triassic extinction event, the largest mass extinction event of the Phanerozoic Era, when both global biodiversity and alpha diversity (community-level diversity) were devastated. (Adapted from: https://en.wikipedia.org/wiki/Changhsingian)

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