Guzhangian

EtymologyName formalityFormalName ratified2008Former name(s)Cambrian Stage 7Usage informationCelestial bodyEarthRegional usageGlobal (ICS)Time scale(s) usedICS Time ScaleDefinitionChronological unitAgeStratigraphic unitStageFirst proposed byShanchi et al., 2007Time span formalityFormalLower boundary definitionFAD of the TrilobiteLejopyge laevigataLower boundary GSSPLuoyixi section, Luoyixi, Guzhang, Hunan, China
28°43′12″N109°57′53″E / 28.7200°N 109.9647°E / 28.7200; 109.9647Lower GSSP ratified2008Upper boundary definitionFAD of the TrilobiteGlyptagnostus reticulatusUpper boundary GSSPPaibi section, Paibi, Hunan, China
28°23′22″N109°31′33″E / 28.3895°N 109.5257°E / 28.3895; 109.5257Upper GSSP ratified2003

28°43′12″N109°57′53″E / 28.7200°N 109.9647°E / 28.7200; 109.9647 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 name Guzhangian is derived from Guzhang County, Hunan Province, China.