Time of Geologic

Eon	Era	Period	Epoch	Old Periods
Phanerozoic Eon 543 mya to Present	Cenozoic Era 65 mya to Present	Neogene	Holocene	Quaternary    1.8 mya to Present
			Pleistocene
			Pliocene	Tertiary    65 to 1.8 mya
			Miocene
		Paleogene	Oligocene
			Eocene
			Paleocene
	Mesozoic Era 248 mya to 65 mya	Cretaceous   144 mya to 65 mya
		Jurassic   206 to 144 mya
		Triassic   248 to 206 mya
	Paleozoic Era 543 to 248 mya	Permian   290 to 248 mya
		Carboniferous   354 to 290 mya
		Devonian   417 to 354 mya
		Silurian   443 to 417 mya
		Ordovician   490 to 443 mya
		Cambrian   543 to 490 mya
Precambrian Time 4,500 to 543 mya	Proterozoic Era 2,500 to 543 mya
	Archaean 3,800 to 2,500 mya
	Hadean 4,500 to 3,800 mya