Geologic Time

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Type Start (million yrs ago) End (million yrs ago) Total yrs (millions)
Precambrian 4600 542 4058
Hadeon Eon 4600 3800 800
Archean Eon 3800 2500 1300
Proterozoic Eon 2500 542 1958
Phanerozoic Eon 542 251 291
Cambrian Period 542 488 54
Ordovician Period 488 443 45
Silurian Period 443 416 27
Devonian Period 416 359 57
Carboniferous Period 359 299 60
Permian Period 299 251 48
Mesozoic Era 251 65.5 185.5
Triassic Period 251 199 52
Jurassic Period 199 145 54
Cretaceous Period 145 65.5 79.5
Cenozoic Era 65.5 0 65.5
Paleogene Period 65.5 23 42.5
Paleocene Epoch 65.5 55.8 9.7
Eocene Epoch 55.8 33.9 21.9
Oligocene Epoch 33.9 23 10.9
Neogene Period 23 0 23
Miocene Epoch 23 5.3 17.7
Pliocene Epoch 5.3 1.8 3.5
Pleistocene Epoch 1.8 0.018 1.782
Holocene Epoch 0.012 0 0.012
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