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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 × 106years before present. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| Although the sampling intensity from time to time and place to place could bias our knowledge on the existant biodiversity during different periods of the Phanerozoic Era, the fossil record of nonmarine tetrapods from the Devonian era (approximately 400 million years ago) onward exhibits an average of about 50 families until the last quarter of the |
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