| Geologic Time Scale |
| EON | ERA | PERIOD | EPOCH | MYBP* |
|---|---|---|---|---|
| Phanerozoic | 544 to Present | |||
| Cenozoic | 65 to Present | |||
| Quaternary | 1.8 to Present | |||
| Holocene | 0.008 to Present | |||
| Pleistocene | 1.8 to 0.008 | |||
| Tertiary | 65 to 1.8 | |||
| Pliocene | 5.30 to 1.8 | |||
| Miocene | 23.8 to 5.3 | |||
| Oligocene | 33.7 to 23.8 | |||
| Eocene | 55.5 to 33.7 | |||
| Paleocene | 65 to 55.5 | |||
| Mesozoic | 248 to 65 | |||
| Cretaceous | 145 to 65 | |||
| Jurassic | 213 to 145 | |||
| Triassic | 248 to 213 | |||
| Paleozoic | 544 to 248 | |||
| Permian | 286 to 248 | |||
| Pennsylvanian | Carboniferous | 360 to 286 | ||
| Mississippian | 360 to 325 | |||
| Devonian | 410 to 360 | |||
| Silurian | 440 to 410 | |||
| Ordovician | 505 to 440 | |||
| Cambrian | 544 to 505 | |||
| Cryptozoic (Precambrian) | 4400 to 544 | |||
| Proterozoic | 2500 to 544 | |||
| Vendian (Ediacaran) | 544 to 650 | |||
| Archaean | 3800 to 2500 | |||
| Hadean | 4500 to 3800 | |||
| * MYBP = Millions of Years Before Present |
| Times and names are from U.S.G.S Publication Geologic Time |
