Geologic Time Periods
The twelve periods of the Phanerozoic eon, from the Cambrian to today.
| Period | Began (Mya) |
|---|---|
| Quaternary | 2.58 |
| Neogene | 23 |
| Paleogene | 66 |
| Cretaceous | 145 |
| Jurassic | 201 |
| Triassic | 252 |
| Permian | 299 |
| Carboniferous | 359 |
| Devonian | 419 |
| Silurian | 444 |
| Ordovician | 485 |
| Cambrian | 541 |
12 entries · Source: Wikipedia