Geological Periods
| Period . | Date x 106 (yrs) ago . | . |
|---|---|---|
| Archaen Eon | 4,500 – 2,500 | Earth Forms Prokaryotes |
| Proterozoic Eon | 2,500 – 1,000 | First Single-cell Eukaryotes Slow Oxygen Rise |
| Ediacaran | 1,000 – 542 | First Multi-cell Eukaryotes Next Oxygen Rise |
| Cambrian | 542 – 488 | Biominerals Explosion of Species |
| Ordovician | 488 – 443 | Vertebrates First Land Plants |
| Silurian | 443 – 415 | |
| Devonian | 415 – 358 | |
| Carboniferous | 358 – 300 | Coal Formation |
| Permian | 300 – 252 | First Extinction |
| Triassic | 252 – 200 | |
| Jurassic | 200 – 150 | Earliest Birds |
| Cretaceous | 150 – 70 | Seeds of Plants |
| Paleogene | 70 – 25 | |
| Neogene | 25 → | Homo Sapiens |
| Period . | Date x 106 (yrs) ago . | . |
|---|---|---|
| Archaen Eon | 4,500 – 2,500 | Earth Forms Prokaryotes |
| Proterozoic Eon | 2,500 – 1,000 | First Single-cell Eukaryotes Slow Oxygen Rise |
| Ediacaran | 1,000 – 542 | First Multi-cell Eukaryotes Next Oxygen Rise |
| Cambrian | 542 – 488 | Biominerals Explosion of Species |
| Ordovician | 488 – 443 | Vertebrates First Land Plants |
| Silurian | 443 – 415 | |
| Devonian | 415 – 358 | |
| Carboniferous | 358 – 300 | Coal Formation |
| Permian | 300 – 252 | First Extinction |
| Triassic | 252 – 200 | |
| Jurassic | 200 – 150 | Earliest Birds |
| Cretaceous | 150 – 70 | Seeds of Plants |
| Paleogene | 70 – 25 | |
| Neogene | 25 → | Homo Sapiens |