Lochkovian
Period
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The Lochkovian is one of three faunal stages in the Early Devonian Epoch. It lasted from 419.2 ± 3.2 million years ago to 410.8 ± 2.8 million years ago. It marked the beginning of the Devonian Period, and was followed by the Pragian Stage. Wikipedia
Epoch: Lower Devonian
Occurred: 419.2 (+/- 3.2) million years ago - 410.8 (+/- 2.8) million years ago
Lower boundary definition: FAD of the graptolite Monograptus uniformis
Lower boundary GSSP: Klonk, Prague, Czech Republic; 49°51′18″N 13°47′31″E / 49.8550°N 13.7920°E
Lower GSSP ratified: 1972
Upper boundary definition: FAD of the conodonts Eognathodus sulcatus and Latericriodus steinachensis Morph beta
Upper boundary GSSP: Velká Chuchle quarry, Velká Chuchle, Prague, Czech Republic; 50°00′53″N 14°22′21″E / 50.0147°N 14.3726°E
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