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Mesozoic

EtymologyName formalityFormalNickname(s)Age of Reptiles, Age of Dinosaurs, Age of ConifersUsage informationCelestial bodyEarthRegional usageGlobal (ICS)Time scale(s) usedICS Time ScaleDefinitionChronological unitEraStratigraphic unitErathemTime span formalityFormalLower boundary definitionFirst appearance of the Conodont Hindeodus parvus.Lower boundary GSSPMeishan, Zhejiang, China31°04′47″N119°42′21″E / 31.0798°N 119.7058°E / 31.0798; 119.7058Lower GSSP ratified2001Upper boundary definitionIridium enriched layer associated with a major meteorite impact and subsequent K-Pg extinction event.Upper boundary GSSPEl Kef Section, El Kef, Tunisia36°09′13″N8°38′55″E / 36.1537°N 8.6486°E / 36.1537; 8.6486Upper GSSP ratified1991The Mesozoic Era is an era of Earth's geological history, lasting from about 252 to 66 million years ago, comprising the Triassic, Jurassic and CretaceousPeriods.

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