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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 to million years ago (Ma). It was preceded by the Wuchiapingian and followed by the Induan.〔See Gradstein ''et al.'' (2004) for a detailed geologic timescale〕 The greatest mass extinction event in the Phanerozoic eon occurred during this age. The extinction rate peaked about a million years before the end of this stage. ==Stratigraphic definitions== The Changhsingian is named after Changxing () in northern Zhejiang, China. The stage was named for the Changhsing Limestone.〔The Changhsing Limestone was named by Grabau (1923)〕 The name was first used for a stage in 1970〔By Furnish & Glenister (1970); see also Furnish & Glenister (1973)〕 and was anchored in the international timescale in 1981.〔The Changhsingian stage and its GSSP were described by Jin ''et al.'' (1981)〕 The base of the Changhsingian stage is at the first appearance of conodont species ''Clarkina wangi''. The global reference profile is profile D at Meishan, in the type area in Changxing.〔 The top of the Changhsingian (the base of the Induan stage and the Triassic system is at the first appearance of conodont species ''Hindeodus parvus''. The Changhsingian stage contains only one ammonite biozone: that of the genus ''Iranites''. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Changhsingian」の詳細全文を読む スポンサード リンク
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