Geologic time scale

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4 Terms

1
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Cenozoic

quaterny,tertiary, present-65ma(mammals)

2
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mesozoic

cretaceous, jurassic, triassic, 65-250ma, dinosaurs

3
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paleozoic

permian,carboniferous, devonian, silurian, ordovician, cambrian, 250-540ma, 1st vertebrates and insects and plants

4
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precambrian

mostly bacteria