Norian

EtymologyName formalityFormalUsage informationCelestial bodyEarthRegional usageGlobal (ICS)Time scale(s) usedICS Time ScaleDefinitionChronological unitAgeStratigraphic unitStageTime span formalityFormalLower boundary definitionNot formally definedLower boundary definition candidatesBase of ammonoid zone and near FAD of Metapolygnathus echinatus within the M. communistiConodont zonesLower boundary GSSP candidate section(s)

• , British Columbia, Canada
• , Sicily, Italy

Upper boundary definitionNot formally definedUpper boundary definition candidates

• FAD of the Conodont Misikella posthernsteini
• Near FAD of the Ammonitegenus
• Near FAD of the Conodont Epigondolella mosheri
• Near FAD of the Radiolarian

Upper boundary GSSP candidate section(s)

• , Austria
• , Italy
• Turkey
• British Columbia, Canada

The Norian is a division of the TriassicPeriod. It has the rank of an age (geochronology) or stage (chronostratigraphy). It lasted from 227.3 to 205.7 million years ago. It was preceded by the Carnian and succeeded by the Rhaetian.