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Cambrian

Subdivision of the Cambrian according to the ICS, as of 2024.Vertical axis scale: Millions of years agoEtymologyName formalityFormalUsage informationCelestial bodyEarthRegional usageGlobal (ICS)Time scale(s) usedICS Time ScaleDefinitionChronological unitPeriodStratigraphic unitSystemFirst proposed byAdam Sedgwick, 1835Time span formalityFormalLower boundary definitionAppearance of the IchnofossilTreptichnus pedumLower boundary GSSPFortune Head section, Newfoundland, Canada47°04′34″N55°49′52″W / 47.0762°N 55.8310°W / 47.0762; -55.8310Lower GSSP ratifiedAugust 1992 (as base of Cambrian)Upper boundary definitionFAD of the ConodontIapetognathus fluctivagus.Upper boundary GSSPGreenpoint section, Green Point, Newfoundland, Canada49°40′58″N57°57′55″W / 49.6829°N 57.9653°W / 49.6829; -57.9653Upper GSSP ratifiedJanuary 2000Atmospheric and climatic dataSea level above present dayRising steadily from 4 m to 90 mThe Cambrian ( ) is the first geological period of the Paleozoic Era and the Phanerozoic Eon.

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