Eoarchean
Eoarchean
| Hierarchy: | Precambrian Archean Eoarchean |
|---|---|
| Classification: | Era (as per International Commission on Stratigraphy) |
| Top: | 3600 Ma |
| Base: | 4000 Ma |
| Preceeds: | Paleoarchean |
| Follows: | Hadean Early Imbrian |
| GSSP: | Base is not defined |
Simple single-celled life (probably bacteria and archaea). Oldest probable microfossils. The first life forms and self-replicating RNA molecules evolve around 4000 Ma, after the Late Heavy Bombardment ends on Earth. Napier Orogeny in Antarctica, 4000 ± 200 Ma.
Geologic Events
| Event Name | Type | Age | Area |
|---|---|---|---|
| Naiper orogeny | Orogeny | 4000 ± 200 Ma | Antarctica |
| Late Heavy Bombardment (concludes) | Impact Event | ~4100 - ~3800 Ma | Global |
| First life (concludes) | Evolutionary event | ~4280 - ~3500 Ma | Global |
Overview of geological time
List all geological events