The Archean 4 Eras

Eoarchean Era

Start Date: 4,000 million years ago

End Date: 3,600 million years ago

Paleoarchean Era

Start Date: 3,600 million years ago

End Date: 3,200 million years ago

Mesoarchean Era

Start Date: 3,200 million years ago

End Date: 2,800 million years ago

Neoarchean Era

Start Date: 2,800 million years ago

End Date: 2,500 million years ago