Eifelian

EtymologyName formalityFormalUsage informationCelestial bodyEarthRegional usageGlobal (ICS)Time scale(s) usedICS Time ScaleDefinitionChronological unitAgeStratigraphic unitStageTime span formalityFormalLower boundary definitionFAD of the conodontPolygnathus costatus partitusLower boundary GSSP, , Eifel, Germany
50°08′59″N6°28′18″E / 50.1496°N 6.4716°E / 50.1496; 6.4716Lower GSSP ratified1985Upper boundary definitionFAD of the conodont Polygnathus hemiansatusUpper boundary GSSP, Tafilalt, Morocco
31°14′15″N4°21′15″W / 31.2374°N 4.3541°W / 31.2374; -4.3541Upper GSSP ratified1994

The Eifelian is the first of two faunal stages in the Middle Devonian Epoch. It lasted from 393.47 ± 0.99 million years ago to 387.95 ± 1.04 million years ago. It was preceded by the Emsian Stage and followed by the Givetian Stage.

North American subdivisions of the Eifelian Stage include Southwood, and part of Cazenovia (or Cazenovian).