Last Modified 08/27/2008
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Era Period Epoch Approximate duration (millions of years) Approximate number of years ago (millions of years) Cenozoic Quaternary Holocene 10,000 years ago to the present Pleistocene 2 .01 Tertiary Pliocene 11 2 Miocene 12 13 Oligocene 11 25 Eocene 22 36 Paleocene 71 58 Mesozoic Cretaceous 71 65 Jurassic 54 136 Triassic 35 190 Paleozoic Permian 55 225 Carboniferous 65 280 Devonian 60 345 Silurian 20 405 Ordovician 75 425 Cambrian 100 500 Precambrian 3,380 600