Guzhangian

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Period

The Guzhangian is an uppermost stage of the Miaolingian Series of the Cambrian. It follows the Drumian Stage and precedes the Paibian Stage of the Furongian Series. The base is defined as the first appearance of the trilobite Lejopyge laevigata... Wikipedia

Occurred: 500.5 million years ago - 497 million years ago

Epoch: Miaolingian

Lower boundary GSSP: Luoyixi section, Luoyixi, Guzhang, Hunan, China; 28°43′12″N 109°57′53″E / 28.7200°N 109.9647°E

Lower GSSP ratified: 2008

Upper boundary GSSP: Paibi section, Paibi, Hunan, China; 28°23′22″N 109°31′33″E / 28.3895°N 109.5257°E

Upper GSSP ratified: 2003