Chattian

Formerly part ofTertiaryPeriod/SystemEtymologyName formalityFormalUsage informationCelestial bodyEarthRegional usageGlobal (ICS)Time scale(s) usedICS Time ScaleDefinitionChronological unitAgeStratigraphic unitStageTime span formalityFormalLower boundary definition of the Planktonic Foraminifer (Base of Foram Zone P21b)Lower boundary GSSP, Central Apennines, Italy
43°38′48″N12°28′04″E / 43.6466°N 12.4677°E / 43.6466; 12.4677Lower GSSP ratifiedSeptember 2016Upper boundary definition

• Base of magnetic polarity chronozone C6Cn.2n.
• FAD of the Planktonic Foraminiferan

Upper boundary GSSPLemme-Carrosio Section, Carrosio, Italy
44°39′32″N8°50′11″E / 44.6589°N 8.8364°E / 44.6589; 8.8364Upper GSSP ratified1996

The Chattian is, in the geologic timescale, the younger of two ages or upper of two stages of the OligoceneEpoch/Series. It spans the time between 27.3 and23.04 Ma. The Chattian is preceded by the Rupelian and is followed by the Aquitanian (the lowest stage of the Miocene).