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The second of six periods of the Paleozoic Era. The Ordovician spans 41.2 million years from the end of the Cambrian Period
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At the beginning of the Paleozoic was the first time that multi cellular life forms flourished on Earth.
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The Permian witnessed the diversification of the early amniotes into the ancestral groups of the mammals, turtles, lepidosaurs and archosaurs.
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Is a geologic period and system which spans 50.9 million years from the end of the Permian Period 252.17 million years ago (Mya), to the beginning of the Jurassic Period 201.3 Mya. The Triassic is the first period of the Mesozoic Era.
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The first period of the Cenozoic Era, which began 65 Ma ago and lasted approximately 63.2 Ma
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The Cretaceous Period was the last and longest segment of the Mesozoic Era. It lasted approximately 79 million years
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The Jurassic constitutes the middle period of the Mesozoic Era, also known as the Age of Reptiles. The start of the period is marked by the major Triassic–Jurassic extinction event.
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Is famous for its vast swamp forests, such as the one depicted here.
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The Devonian is a geologic period and system of the Paleozoic, spanning 60 million years from the end of the Silurian, 419.2 million years ago
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The Silurian is a geologic period and system spanning 24.6 million years from the end of the Ordovician Period, at 443.8 million years ago
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The first time that multi- cellular life forms flourished on Earth.
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