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Guzhangian Stage
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A chart showing the Cambrian period within the Paleozoic era on the geologic time scale, listing its epochs, stages, and corresponding ages in millions of years ago, with color-coded divisions and notes on boundary definitions.
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Cambrian Period in geologic time
Cambrian Period in geologic time The Cambrian Period and its subdivisions.

Guzhangian Stage

geology and stratigraphy
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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Britannica Editors
Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree....
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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