Coordinates: 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 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 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.
|Arthropods of the Guzhangian|
|"Stage 3"-Guzhangian||Burgess Shale, British Columbia, Canada; Yuanshan Formation, Chengjiang biota, China|
|"Stage 5"-Guzhangian||Phyllopod Bed, Burgess Shale|
|Dinocarididans of the Guzhangian|
|"Stage 5"-Guzhangian||Burgess Shale|
|Fortunian-Guzhangian||Phyllopod bed, Walcott Quarry, Burgess Shale, British Columbia, Canada; Koscierzyna borehole, Kashubia, Poland|
- "GSSP for Guzhangian Stage". Retrieved 12 November 2012.
- Peng, Shanchi; Loren E. Babcok; Jingxun Zuo; Huanling LIn; Xuejian Zhu; Xianfeng Yang; Richard A. Ribosn; Yuping Qui; Gabriella Bagnoli; Yong'an Chen (2009). "The Global Boundary Stratotype Section and Point (GSSP) of the Guzhangian Stage (Cambrian) in the Wuling Mountains, Northwestern Hunan, China" (PDF). Episodes. 32 (1): 41–55. Retrieved 14 September 2012.
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