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    Late Pleistocene
    Middle Pleistocene
   Late Cretaceous
   Early Cretaceous
   Late Jurassic
   Middle Jurassic
   Early Jurassic
   Late Triassic
   Middle Triassic
   Early Triassic
   Late Devonian
   Middle Devonian
   Early Devonian
   Late Ordovician
   Middle Ordovician
   Early Ordovician
    Cambrian Stage 10
   Cambrian Series 3
    Cambrian Stage 5
   Cambrian Series 2
    Cambrian Stage 4
    Cambrian Stage 3
    Cambrian Stage 2
  Early Imbrian
  Basin Groups
Hierarchy:Precambrian Archean
Classification:Era (as per International Commission on Stratigraphy)
Top:3600 Ma
Base:4000 Ma
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
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