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Middle Paleocene

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 definitionOnset of sea-level drop and carbon isotope shiftLower boundary GSSPZumaia Section, Basque Country, Spain43°17′57″N2°15′40″W / 43.2992°N 2.2610°W / 43.2992; -2.2610Lower GSSP ratified2008Upper boundary definitionBase of magnetic polarity chronozone C26nUpper boundary GSSPZumaia Section, Basque Country, Spain43°17′59″N2°15′39″W / 43.2996°N 2.2609°W / 43.2996; -2.2609Upper GSSP ratified2008The Selandian is a stage in the Paleocene.

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