Coordinates: 28°43′12″N 109°57′53″E / 28.7200°N 109.9647°E 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 (28°43′12″N 109°57′53″E / 28.7200°N 109.9647°E), where Lejopyge laevigata has its first appearance.
- ^ a b "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". Episodes 32 (1): 41–55. Retrieved 14 September 2012.