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Rhaetian

Subdivision of the Triassic 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 unitAgeStratigraphic unitStageTime span formalityFormalLower boundary definitionNot formally definedLower boundary definition candidatesFAD of the ConodontMisikella posthernsteiniNear FAD of the AmmonitegenusNear FAD of the Conodont Epigondolella mosheriNear FAD of the RadiolarianLower boundary GSSP candidate section(s), Austria, ItalyTurkeyBritish Columbia, CanadaUpper boundary definitionFAD of the Ammonite Psiloceras spelae tirolicumUpper boundary GSSPKuhjoch section, Karwendel mountains, Northern Calcareous Alps, Austria47°29′02″N11°31′50″E / 47.4839°N 11.5306°E / 47.4839; 11.5306Upper GSSP ratified2010The Rhaetian is the latest age of the TriassicPeriod (in geochronology) or the uppermost stage of the Triassic System (in chronostratigraphy).

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