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Ludlow Epoch

Subdivision of the Silurian according to the ICS, as of 2024.Vertical axis scale: Millions of years agoEtymologyName formalityFormalName ratified1980Usage informationCelestial bodyEarthRegional usageGlobal (ICS)Time scale(s) usedICS Time ScaleDefinitionChronological unitEpochStratigraphic unitSeriesTime span formalityFormalLower boundary definitionFAD of the GraptoliteLower boundary GSSP, Ludlow, U.K.52°21′33″N2°46′38″W / 52.3592°N 2.7772°W / 52.3592; -2.7772Lower GSSP ratified1980Upper boundary definitionFAD of the Graptolite Monograptus parultimus.Upper boundary GSSP, Prague-Řeporyje, Czech Republic50°01′40″N14°19′30″E / 50.0277°N 14.3249°E / 50.0277; 14.3249Upper GSSP ratified1984In the geological timescale, the Ludlow Epoch or Mid-Late Silurian (from 426.7 ± 1.5 million years ago to 422.7 ± 1.6 million years ago) occurred during the Silurian Period, after the end of the Homerian Age.

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