Jiangshanian

EtymologyName formalityFormalName ratified2011Former name(s)Cambrian Stage 9Usage informationCelestial bodyEarthRegional usageGlobal (ICS)Time scale(s) usedICS Time ScaleDefinitionChronological unitAgeStratigraphic unitStageTime span formalityFormalLower boundary definitionFAD of the TrilobiteAgnostotes orientalisLower boundary GSSPDuibian B Section, , Zhejiang, China
28°48′57″N118°36′54″E / 28.815967°N 118.614933°E / 28.815967; 118.614933Lower GSSP ratified2011Upper boundary definitionNot formally definedUpper boundary definition candidatesFAD of the Trilobite Lotagnostus americanusUpper boundary GSSP candidate section(s), Zhejiang, China

The Jiangshanian is the middle stage of the Furongian series. It follows the Paibian Stage and is succeeded by the still unnamed Stage 10 of the Cambrian. The base is defined as the first appearance of the trilobiteAgnostotes orientalis which is estimated to be 494.2 million years ago. The Jiangshanian lasted until approximately 491 million years ago.

The Jiangshanian stage was named after Jiangshan, a city in China's Zhejiang province, where its GSSP was defined.