History of Life

Eon	Era	Period		Epoch
Fanerozoic	Cenozoic	Quaternary		Holocene
				Pleistocene
		Tertiary		Pliocene
				Miocene
				Oligocene
				Eocene
				Paleocene
	Mesozoic	Cretaceous
		Jurassic
		Triassic
	Paleozoic	Permian
		Carboniferous	Pennsylvanian
			Mississipian
		Devonian
		Silurian
		Ordovician
		Cambrian
Precambrian (Archaean)	Proterozoic
	Archeozoic
	Azoic