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Guzhangian Stage
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Cambrian Period in geologic time
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Guzhangian Stage

geology and stratigraphy
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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

Guzhangian Stage, last of three internationally defined stages of the Series 3 epoch of the Cambrian Period, encompassing all rocks deposited during the Guzhangian Age (approximately 500.5 million to 497 million years ago).

In 2008 the International Commission on Stratigraphy established the Global Stratotype Section and Point (GSSP) defining the base of this unit in the carbonate rock beds of the Huaqiao Formation in the Wuling Mountains of Hunan, China. The GSSP marks the first appearance of the trilobite Lejopyge laevigata in the fossil record. The Guzhangian Stage follows the Drumian Stage of Series 3 and precedes the Paibian Stage of the Furongian Series.

John P. Rafferty