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The Devonian is notable for the rapid diversification in fish. Near the end of this period, a mass extinction event occurs, considered to be the second of the ‘big five’ mass extinction events of Earth’s history.
The Devonian Period of the Earth’s history lasts 60 million years, beginning 420 and ending 360 million years ago.
The Devonian is a relatively warm period and probably lacks any glaciers. The temperature gradient from the equator to the poles is not as large as it is today.
The Devonian is notable for the rapid diversification in fish. Many of them grow to large sizes and are fearsome predators. The first abundant genus of shark, Cladoselache, appears in the oceans during the Devonian Period. The Devonian seas are dominated by brachiopods.
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