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440 million years ago (Ordovician-silurian Extinction)

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440 million years ago (Ordovician-silurian Extinction)

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In this extinction event, many small organisms of the sea became extinct.

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365 million years ago (Devonian Extinction)

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365 million years ago (Devonian Extinction)

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This event end of more than 90 percent of the Earth's species.

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250 million years ago (Permian-triassic Extinction)

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250 million years ago (Permian-triassic Extinction)

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Extinct creatures were actually roaming around the Karoo hundreds of thousands of years later than the time scientists had written them off.

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210 million years ago (Triassic-jurassic Extinction)

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210 million years ago (Triassic-jurassic Extinction)

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Therapsids and archosaurs were the chief terrestrial vertebrates during this time.

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65 million years ago (Cretaceous-tertiary Extinction)

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65 million years ago (Cretaceous-tertiary Extinction)

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The extinction that occurred 65 million years ago wiped out some 50 percent of plants and animals.