The Devonian is a geologic period of the Paleozoic Era spanning approximately 419 to 359 million years ago, defined chronostratigraphically by its base at the first appearance of the conodont Ireviken datum near the onset of the Lochkovian Stage and its top near major biotic turnovers preceding the Carboniferous. It is subdivided into Early, Middle, and Late epochs (with stages including Lochkovian through Famennian) and is characterized by significant diversification of marine invertebrates and fishes, widespread reef development, and major terrestrialization events involving vascular plants and early tetrapods, all recorded in globally correlated stratigraphic sequences and isotope excursions.
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