Geological time scale

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Last updated 4:14 AM on 4/21/26
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8 Terms

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Precambrian era

  • earliest and largest part of earth’s history

  • spanning 4.6 billion years ago to 538 million years ago

  • hadean, Archean, proterozoic, and phanerozic eons are considered to be part of the precambrian era

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Paleozoic era

  • 538-251 million years ago

  • rapid diversification in marine life (Cambrian explosion)

  • includes: cambrian period, ordovician period, Silurian period, Devonian period, and permian period

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mesozoic era

  • 256-66 million years ago

  • includes the triassic-jurrasic period, Cretaceous period

  • ended with mass extinction

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Cenozoic era

  • from 66 million years ago till now

  • known as the age of the mammals

  • began after Cretaceous period that eliminated dinosaurs (expect for flying ones)

  • saw a rise in mountain ranges, and cooling climate

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time scale

big to small

  1. eon, era, period, epoch

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eons

recent to oldest

  • Phanerozoic

  • proterozoic

  • Archean

  • hadean

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Neoglacial period

the end of the holocene climactic optimum, where the planet could and entered a phase called:

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holocene climatic optimum

was a warm period in the first half of the Holocene epoch, that occurred in the interval roughly 9,500 to 5,500 years