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formation of the earth
4.6 BYA
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Precambrian consists of
archean and proterozoic
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archean era was when
atmosphere was low in O2, cyanobacteria
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end of proterozoic
543 MYA where there were only multicelluar organisms
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in the paleozoic era
Cambrian, devonian, and permian
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cambrian period
cambrian explosion
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Devonian
400mya fishes with jaws, insects, wooded plants
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phanerozoic epoch
paleozoic, mesozoic era, and cenozoic
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mesozoic era contained
triassic, jurassic, and cretaceous
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Jurassic
the middle of the mesozoic era
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cretaceous
65mya extinction of dinosaurs
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Cenozoic era
last era contains tertiary and quaternary
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quaternary
1.8mya pleistocene, pilocene and milocene
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