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 | |||
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