Geologic Timescale

Geologic Timescale

EraPeriodEpoch Approximate duration (millions of years) Approximate number of years ago (millions of years)
Cenozoic 7 Quaternary 2Holocene10,000 years ago to the present 
Pleistocene2.01
Tertiary 5Pliocene112
Miocene1213
Oligocene1125
Eocene2236
Paleocene7158
Mesozoic 3Cretaceous 7165
Jurassic 54136
Triassic 35190
Paleozoic 6Permian 55225
Carboniferous 65280
Devonian 60345
Silurian 20405
Ordovician 75425
Cambrian 100500
Precambrian1  >4,000600
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1 Not an era but the time preceding the Cambrian.

The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.

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