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Botomian

Subdivision of the Cambrian according to the ICS, as of 2024.Vertical axis scale: Millions of years agoEtymologyName formalityInformalUsage informationCelestial bodyEarthRegional usageGlobal (ICS)Time scale(s) usedICS Time ScaleDefinitionChronological unitAgeStratigraphic unitStageTime span formalityFormalLower boundary definitionNot formally definedLower boundary definition candidatesFAD of the TrilobiteOlenellus or RedlichiaLower boundary GSSP candidate section(s)NoneLower GSSP ratifiedNot formally definedUpper boundary definitionFAD of Oryctocephalus indicus.Upper boundary GSSP, Guizhou, China26°04′51″N108°24′50″E / 26.0807°N 108.4138°E / 26.0807; 108.4138Upper GSSP ratifiedJune 25, 2018Cambrian Stage 4 is the still unnamed fourth stage of the Cambrian and the upper stage of Cambrian Series 2.

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