Lutetian

Formerly part ofTertiaryPeriod/SystemEtymologyName formalityFormalUsage informationCelestial bodyEarthRegional usageGlobal (ICS)Time scale(s) usedICS Time ScaleDefinitionChronological unitAgeStratigraphic unitStageTime span formalityFormalLower boundary definitionFAD of the calcareous nannofossil Lower boundary GSSPGorrondatxe section, Western Pyrenees, Basque Country, Spain
43°22′47″N3°00′51″W / 43.3796°N 3.0143°W / 43.3796; -3.0143Lower GSSP ratifiedApril 2011Upper boundary definitionNot formally definedUpper boundary definition candidatesCalcareous nannofossil near of the HaptophyteReticulofenestra reticulataUpper boundary GSSP candidate section(s)Contessa highway section, Gubbio, Central Apennines, Italy

The Lutetian is, in the geologic timescale, a stage or age in the Eocene. It spans the time between 48.07 and41.03 Ma. The Lutetian is preceded by the Ypresian and is followed by the Bartonian. Together with the Bartonian it is sometimes referred to as the Middle Eocene Subepoch.