Archean
| Archean Eon 4000–2500 million years aby | |
-4500 — – -4000 — – -3500 — – -3000 — – -2500 — – -2000 — – -1500 — – -1000 — – -500 — – 0 — |
The Archean Eon (an aw spelled Archaean or Archæan) is ane o the fower geologic eons o Yird history, occurrin 4,000 tae 2,500 million years aby (4 to 2.5 billion year aby).