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Bartonian

Subdivision of the Paleogene according to the ICS, as of 2024.Vertical axis scale: Millions of years agoFormerly part ofTertiaryPeriod/SystemEtymologyName formalityFormalUsage informationCelestial bodyEarthRegional usageGlobal (ICS)Time scale(s) usedICS Time ScaleDefinitionChronological unitAgeStratigraphic unitStageTime span formalityFormalLower boundary definitionNot formally definedLower boundary definition candidatesCalcareous nannofossil near of the HaptophyteReticulofenestra reticulataLower boundary GSSP candidate section(s)Contessa highway section, Gubbio, Central Apennines, ItalyUpper boundary definitionLAD of the large acarininids and the ForaminiferanUpper boundary GSSPAlano section, Piave river, Venetian Prealps, Belluno, Italy45°54′51″N11°55′05″E / 45.9141°N 11.9180°E / 45.9141; 11.9180Upper GSSP ratifiedFebruary 2020The Bartonian is, in the International Commission on Stratigraphy's (ICS) geologic time scale, a stage or age in the middle of the EoceneEpoch or Series.

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