Santonian

EtymologyName formalityFormalUsage informationCelestial bodyEarthRegional usageGlobal (ICS)Time scale(s) usedICS Time ScaleDefinitionChronological unitAgeStratigraphic unitStageTime span formalityFormalLower boundary definitionFAD of the InoceramidBivalveCladoceramus undulatoplicatusLower boundary GSSPOlazagutia, Spain
42°52′00″N2°11′48″W / 42.8668°N 2.1968°W / 42.8668; -2.1968Lower GSSP ratifiedJanuary 2013Upper boundary definitionBase of Chron C33rUpper boundary GSSPBottaccione, Gubbio, Italy
43°21′46″N12°34′58″E / 43.3627°N 12.5828°E / 43.3627; 12.5828Upper GSSP ratifiedOctober 2022

The Santonian is an age in the geologic timescale or a chronostratigraphicstage. It is a subdivision of the Late CretaceousEpoch or Upper CretaceousSeries. It spans the time between 85.7 ± 0.2 mya (million years ago) and 83.6 ± 0.2 mya. The Santonian is preceded by the Coniacian and is followed by the Campanian.