Eon	Era	Period	
Phanerozoic	Cenozoic	Quaternary	
		Tertiary	
	Mesozoic	Cretaceous	
		Jurassic	
		Triassic	
	Paleozoic	Permian	
		Carboniferous	
		Devonian	
		Silurian	
		Ordovician	
		Cambrian	
Proterozoic	

Archean	
Hadean	

65 mya

250
mya

540
mya

4.6
bya

3.8
bya

2.5
bya

2
mya