Regional stages with which the Wuchiapingian is coeval or overlaps include the Djulfian or Dzhulfian, Longtanian, Rustlerian, Saladoan, and Castilian.[3]
Stratigraphic definitions
The Wuchiapingian was first used in 1962, when the Lopingian series of southwestern China was divided in the Changhsingian and Wuchiapingian formations. In 1973 the Wuchiapingian was first used as a chronostratigraphic unit (i.e. a stage, as opposed to a formation, which is a lithostratigraphic unit).[4]
The base of the Wuchiapingian stage is defined as the place in the stratigraphic record where the conodont species Clarkina postbitteri postbitteri first appears. A global reference profile for this boundary (a GSSP) is located near Laibin in the Chinese province of Guangxi.[5]
The top of the Wuchiapingian (the base of the Changhsingian) is at the first appearance of conodont species Clarkina wangi.
An extinction pulse occurred during the Wuchiapingian; faunas were recovering when another larger extinction pulse, the Permian–Triassic extinction event devastated life.[6]
^Kanmera, Kametoshi; and Nakazawa, Keiji, 1973, Permian-Triassic relationships and faunal changes in the eastern Tethys, in Logan, A.; and Hills, L. V.; eds.; The Permian and Triassic Systems and their mutual boundary, Canadian Society of Petroleum Geologists, Memoir 2, pp. 100–129
^Jin, Y.; Shen, S.; Henderson, C. M.; Wang, X.; Wang, W.; Wang, Y.; Cao, C. & Shang, Q.; 2006: The Global Stratotype Section and Point (GSSP) for the boundary between the Capitanian and Wuchiapingian Stage (Permian), Episodes 29(4), pp. 253–262
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