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Cretaceous- occurring 65.5 mya

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Cambrian explosion: occurred 540 mya, early life forms began to live and thrive

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Ordovician-Silurian: occurring 440 mya. Small marine animals/organisms began to die out.

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Devonian - occurring 365 mya. Many tropical marine species went extinct.

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Permain-triassic- occurring 250 mya largest mass extinction affecting a range of species including vertebrates

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Triassic- Jurassic - occurring 210 mya extinction of many vertebrate species on land allowing dinosaurs to thrive