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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 NameTypeAgeArea
Naiper orogenyOrogeny4000 ± 200 MaAntarctica
Late Heavy Bombardment (concludes)Impact Event~4100 - ~3800 MaGlobal
First life (concludes)Evolutionary event~4280 - ~3500 MaGlobal


Overview of geological time

List all geological events
Mineral and/or Locality  
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