Table 1. Geological Time Scale.
| Subdivisions Based on Time | Rediometric Dates (millions of years ago) | ||
| Era | Period | Epoch | |
| Cenozoic | Quarternary | Holocene | 0 - 0.01 |
| Pleistocene | 0.01 - 1.6 | ||
| Tertiary | Neogene | 1.6 - 5.3 | |
| Neogene | 5.3 - 23.7 | ||
| Paleogene | 23.7 - 36.6 | ||
| Paleogene | 36.6 - 57.8 | ||
| Paleogene | 57.8 - 66.4 | ||
| Mesozoic | Cretaceous | 66.4 - 144 | |
| Jurassic | 144 - 208 | ||
| Triassic | 208 - 245 | ||
| Paleozoic | 245 - 570 | ||
| Precambrian | 570 - 4,500 | ||