Pragian
Geologic period
The Pragian is one of three faunal stages in the Early Devonian Epoch. It lasted from 410.8 ± 2.8 million years ago to 407.6 ± 2.8 million years ago. It was preceded by the Lochkovian Stage and followed by the Emsian Stage. The most important... Wikipedia
Epoch: Lower Devonian
Occurred: 410.8 (+/- 2.8) million years ago - 407.6 (+/- 2.6) million years ago
Lower boundary definition: FAD of the conodonts Eognathodus sulcatus and Latericriodus steinachensis Morph beta
Lower boundary GSSP: Velká Chuchle quarry, Prague, Czech Republic; 50°00′53″N 14°22′21″E / 50.0147°N 14.3726°E
Lower GSSP ratified: 1989
Stratigraphic unit: Stage
Upper boundary definition: FAD of the conodont Polygnathus kitabicus