Middle Devonian

EtymologyName formalityFormalUsage informationCelestial bodyEarthRegional usageGlobal (ICS)Time scale(s) usedICS Time ScaleDefinitionChronological unitEpochStratigraphic unitSeriesTime span formalityFormalLower boundary definitionFad of the ConodontPolygnathus costatus partitusLower boundary GSSP, Eifel hills, Germany
50°08′59″N6°28′18″E / 50.1496°N 6.4716°E / 50.1496; 6.4716Lower GSSP ratified1985Upper boundary definitionFAD of the ConodontAncyrodella rotundibolaUpper boundary GSSP, Montagne Noire, France
43°30′12″N3°05′12″E / 43.5032°N 3.0868°E / 43.5032; 3.0868Upper GSSP ratified1986

In the geological timescale, the Middle Devonian epoch (from 393.47 ± 0.99 million years ago to 382.31 ± 1.36 million years ago) occurred during the Devonian period, after the end of the Emsian age.

The Middle Devonian epoch is subdivided into two stages: Eifelian and Givetian.