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Middle Eocene

Subdivision of the Paleogene according to the ICS, as of 2024.Vertical axis scale: Millions of years agoEtymologyName formalityFormalUsage informationCelestial bodyEarthRegional usageGlobal (ICS)Time scale(s) usedICS Time ScaleDefinitionChronological unitEpochStratigraphic unitSeriesTime span formalityFormalLower boundary definitionStrong negative anomaly in δC values at the PETMLower boundary GSSPDababiya section, Luxor, Egypt25°30′00″N32°31′52″E / 25.5000°N 32.5311°E / 25.5000; 32.5311Lower GSSP ratified2003Upper boundary definition of Planktonic ForaminifersHantkenina and Upper boundary GSSPMassignano quarry section, , Ancona, Italy43°31′58″N13°36′04″E / 43.5328°N 13.6011°E / 43.5328; 13.6011Upper GSSP ratified1992The Eocene (IPA: ) is a geological epoch that began about 56 million years ago (Ma).

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