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Lochkovian

Subdivision of the Devonian according to the ICS, as of 2024Vertical axis scale: Millions of years agoEtymologyName formalityFormalName ratified1985Usage informationCelestial bodyEarthRegional usageGlobal (ICS)Time scale(s) usedICS Time ScaleDefinitionChronological unitAgeStratigraphic unitStageTime span formalityFormalLower boundary definitionFAD of the graptoliteMonograptus uniformisLower boundary GSSPKlonk, Prague, Czech Republic49°51′18″N13°47′31″E / 49.8550°N 13.7920°E / 49.8550; 13.7920Lower GSSP ratified1972Upper boundary definitionFAD of the conodonts and Morph betaUpper boundary GSSP, Velká Chuchle, Prague, Czech Republic50°00′53″N14°22′21″E / 50.0147°N 14.3726°E / 50.0147; 14.3726Upper GSSP ratified1989The Lochkovian is one of three faunal stages in the Early Devonian Epoch.

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