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The Changhsingian is named after Changxing (Chinese: ; pinyin: Chángxìng; Wade-Giles: Ch'ang-hsing) in northern Zhejiang, China. The stage was named for the Changhsing Limestone. The name was first used for a stage in 1970 and was anchored in the international timescale in 1981.
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. 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 when both global biodiversity and alpha diversity (community-level diversity) were devastated. The world after the extinction was almost lifeless, deserted, hot, and dry. Ammonites, fishes, insects, and the tetrapods (cynodonts, amphibians, reptiles, etc.) remained rare and terrestrial ecosystems did not recover for 30 million years.
A genus of temnospondyl amphibian. Arachana was a basal member of Stereospondyli that shared traits with more derived stereospondyl taxa like Lydekkerinidae and especially Rhinesuchidae. Its transitional features place it as part of an entire transitional fauna that existed around the Permo-Triassic boundary.
^Furnish, W.M. & Glenister, B.F.; 1970: Permian ammonite Cyclolobus from the Salt Range, West Pakistan, in: Kummel, B. & Teichert, G. (eds.): Stratigraphic boundary problems, Permian and Triassic of west Pakistan, Geological Department of Kansas University, Special Publication 4, pp 158-176.
^Furnish, W.M. & Glenister, B.F.; 1973: Permian stages names, in: Logan, A. & Hills, L.V.: The Permian and Triassic systems and their mutual boundary, Canadian Society of Petroleum Geologists Memoir 2, pp 522-548.
^ abJin, Y.; Wang, Y.; Henderson, C.; Wardlaw, B.R.; Shen, S. & Cao, C.; 2006: The Global Boundary Stratotype Section and Point (GSSP) for the base of Changhsingian Stage (Upper Permian) Episodes 29(3), p. 175-182, PDF.