When did the Devonian Period begin and end?

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Devonian paleogeography — Devonian Period Distribution of landmasses, mountainous regions, shallow seas, and deep ocean basins during the early Devonian Period. Included in the paleogeographic reconstruction are the locations of the interval's subduction zones.

The Devonian Period, an interval of the Paleozoic Era, began approximately 419.2 million years ago and ended about 358.9 million years ago.1

The boundaries of this period are defined by the International Union of Geological Sciences (IUGS) using Global Stratotype Sections and Points (GSSPs). The base of the Devonian, which marks the transition from the Silurian Period, is established at Klonk in the Czech Republic. The end of the period, marking the boundary with the Carboniferous Period, is identified at a point at La Serre in southern France.2