Lochkovian

EtymologyName 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 Republic
49°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 Republic
50°00′53″N14°22′21″E / 50.0147°N 14.3726°E / 50.0147; 14.3726Upper GSSP ratified1989

The Lochkovian is one of three faunal stages in the Early Devonian Epoch. It lasted from 419.62 ± 1.36 million years ago to 413.02 ± 1.91 million years ago. It marked the beginning of the Devonian Period, and was followed by the Pragian Stage. It is named after the village of Lochkov in the Czech Republic, now part of the city of Prague. The GSSP is located within the at the Klonk Section in Prague.

In North America the Lochkovian Stage is represented by Gedinnian or Helderbergian time.