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Devonian period

   Also found in: Encyclopedia, Wikipedia, Hutchinson 0.04 sec.
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Noun1.Devonian periodDevonian period - from 405 million to 345 million years ago; preponderance of fishes and appearance of amphibians and ammonites
Age of Fishes, Devonian
Paleozoic, Paleozoic era - from 544 million to about 230 million years ago
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The extinction during the Late Devonian period is widely considered one of the five massive extinctions in Earth's prehistory.
New fossils threaten an extinction theory by Harder, B. / Science News
He also notes that in the Late Devonian period, before tectonic motions carried this region north, the area was located in the tropics.
They're not briquettes, but they'll do by Perkins, S. / Science News
At that time, the end of the Devonian period, some new styles of creatures appeared on the scene.
Out of the Swamps by MONASTERSKY, RICHARD / Science News
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