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Devonian period |
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| The extinction during the Late Devonian period is widely considered one of the five massive extinctions in Earth's prehistory. He also notes that in the Late Devonian period, before tectonic motions carried this region north, the area was located in the tropics. At that time, the end of the Devonian period, some new styles of creatures appeared on the scene. |
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Devonian period - from 405 million to 345 million years ago; preponderance of fishes and appearance of amphibians and ammonites