Guzhangian

Key events in the Cambrian

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-550 —

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-540 —

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-530 —

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-520 —

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-510 —

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-500 —

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-490 —

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Ediacaran

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Ordovician

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Fortunian

"Stage 2"

"Stage 3"

"Stage 4"

"Stage 5"

Drumian

Guzhangian

Paibian

Jiangshanian

"Stage 10"

 

 

 

 

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Baykonur
glaciation

Baykonur
glaciation

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←

Orsten Fauna

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Burgess Shale

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Kaili biota

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Archaeocyatha extinction

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Emu Bay Shale

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Sirius Passet biota

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Chengjiang biota

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First Trilobites

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SSF diversification, first brachiopods & archaeocyatha

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First halkieriids, mollusсs, hyoliths SSF

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Treptichnus pedum trace
Large negative peak δ 13C_carb excursion

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First Cloudina & Namacalathus mineral tubular fossils

Stratigraphic scale of the ICS subdivisions and Precambrian/Cambrian boundary.

The Guzhangian is an uppermost stage of the 3rd 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 around ~500.5 million years ago. The Guzhangian-Paibian boundary is marked by the first appearance of the trilobite Glyptagnostus reticulatus around ~497 million years ago.

The name Guzhangian is derived from Guzhang County in Hunan Province of China.

The GSSP is defined in the Huaqiao Formation in Hunan, China. The precise base of the Guzhangian is a limestone layer 121.3 m above the base Huaqiao Formation at the Louyixi section (), where Lejopyge laevigata has its first appearance.