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Geologic Timescale
| Era |
Period |
Epoch |
started (millions of years ago) |
| Cenozoic 66.4 millions of years ago-present time |
Quaternary |
Holocene |
0.01 |
| Pleistocene |
1.6 |
| Tertiary |
Neogene |
Pliocene |
5.3 |
| Miocene |
23.7 |
| Paleogene |
Oligocene |
36.6 |
| Eocene |
57.8 |
| Paleocene |
66.4 |
| Mesozoic 245-66.4 millions of years ago |
Cretaceous |
Late |
97.5 |
| Early |
144 |
| Jurassic |
Late |
163 |
| Middle |
187 |
| Early |
208 |
| Triassic |
Late |
230 |
| Middle |
240 |
| Early |
245 |
| Paleozoic 570-245 millions of years ago |
Permian |
Late |
258 |
| Early |
286 |
| Carboniferous |
Pennsylvanian |
Late |
320 |
| Mississippian |
Early |
360 |
| Devonian |
Late |
374 |
| Middle |
387 |
| Early |
408 |
| Silurian |
Late |
421 |
| Early |
438 |
| Ordovician |
Late |
458 |
| Middle |
478 |
| Early |
505 |
| Cambrian |
Late |
523 |
| Middle |
540 |
| Early |
570 |
| Precambrian time 4500-570 millions of years ago |
4500 |
Geologic Timescale
Copyright © 2001 by Macmillan Reference USA
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