| ERA | EON | PERIOD | EPOCH | YEARS BEFORE PRESENT |
| Cenozoic | Quaternary | Holocene | 11,700 | |
| Pleistocene | 2.58 my | |||
| Neogene | Pliocene | 5.33 my | ||
| Miocene | 23 my | |||
| Paleogene | Oligocene | 33.9 my | ||
| Eocene | 56 my | |||
| Paleocene | 66 my | |||
| Mesozoic | Cretaceous | 145 my | ||
| Jurassic | 201.3 my | |||
| Triassic | 251.9 my | |||
| Paleozoic | Permian | 298.9 my | ||
| Carboniferous | 358.9 my | |||
| Devonian | 419.2 my | |||
| Silurian | 443.8 my | |||
| Ordovician | 485.4 my | |||
| Cambrian | 541 my | |||
| Precambrian | Proterozoic | 2,500 my | ||
| Archean | 4,000 my | |||
| Hadean (formation of Earth) | ~4,600 my |