General Geology History

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Last updated 11:27 PM on 10/14/26
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4 Terms

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Precambrian

4.6 Ga–539 Ma

Earth forms → crust and oceans develop → early life → oxygen rises → supercontinents assemble and break apart → Snowball Earth → complex life

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Paleozoic

539–252 Ma

Cambrian explosion → marine diversification → life colonizes land → Appalachian orogenies → Pangaea forms → Permian mass extinction

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Mesozoic

252–66 Ma

Dinosaurs diversify → Pangaea breaks apart → western North America develops through subduction and accretion → inland seas cover parts of the continent → end-Cretaceous extinction

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Cenozoic

66 Ma–present

Mammals diversify → Laramide mountain building shapes the Rockies → continents approach modern positions → global cooling and ice ages → modern landscapes and humans