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Tertiary period

EtymologyName formalityInformalUsage informationCelestial bodyEarthRegional usageRegional(?)Time scale(s) usedICS Time Scale (formerly)Formerly used byICSDefinitionChronological unitPeriodStratigraphic unitSystemTime span formalityInformalLower boundary definitionK-Pg extinction eventLower boundary GSSPNoneLower GSSP ratifiedN/AUpper boundary definitionBeginning of the Quaternary glaciationUpper boundary GSSPNoneUpper GSSP ratifiedN/AThe Tertiary ( , US also ) is an obsolete geologic period spanning 66 million to 2.6 or 1.8 million years ago.

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