Devonian

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Devonian

Geology of, denoting, or formed in the fourth period of the Palaeozoic era, between the Silurian and Carboniferous periods, lasting 60–70 million years during which amphibians first appeared

Devonian

[di′vō·nē·ən]
(geology)
The fourth period of the Paleozoic Era, covering the geological time span between about 412 and 354 × 106 years before present.