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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
Classification:Eon (as per International Commission on Stratigraphy)
Status:This is a proposed eon and is not yet approved by the ICS or the IUGS.
Top:~4600 Ma
Base:~5000 Ma
Primary Divisions:NeochaotianEochaotian
Name origin:Name derived from mythological chaos.
An unofficially proposed to denote the time preceding the formation of Earth and the moon.

The end of the Chaotian was marked by the hypothetical collision of the as-yet unnamed proto-Earth and a planet-sized body named Theia, leading to the formation of the Earth and the Moon.

Overview of geological time

List all geological events
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