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Changhsingian Stage
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Changhsingian Stage

geology
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Written by
John P. Rafferty
John P. Rafferty writes about Earth processes and the environment. He serves currently as the editor of Earth and life sciences, covering climatology, geology, zoology, and other topics that relate to...
John P. Rafferty
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Article History

Changhsingian Stage, last of two internationally defined stages of the Upper Permian (Lopingian) Series, encompassing all rocks deposited during the Changhsingian Age (254.2 million to 252.2 million years ago) of the Permian Period. The name of the interval is derived from the Chinese county of Changxing.

In 2005 the International Commission on Stratigraphy (ICS) established the Global Stratotype Section and Point (GSSP) defining the base of this unit in Bed 4 of the Changxing Limestone of Meishan, Changhxing county, Zhejiang province, China. It marks the first appearance of the conodont Clarkina wangi in the fossil record. Other important fossils characteristic of this interval include the fusulinids Paleofusulina sinensis and P. minima. The top of the Changhsingian, and thus the boundary between the Permian and Triassic periods, has been demarcated by a GSSP in Bed 27c at the same location; this GSSP was ratified by the ICS in 2001. The Changhsingian Stage lies above the Wuchiapingian Stage of the Permian System, and it is overlain by the Induan Stage of the Triassic System.

John P. Rafferty