A Pictorial History of Life on Earth

Era	Period	Epoch	Millions of Years Ago
Cenozoic	Quaternary	Holocene	0.01
		Pleistocene	2
	Tertiary	Pliocene	5
		Miocene	23
		Oligocene	34
		Eocene	55
		Paleocene	65
Mesozoic	Cretaceous		141
	Jurassic		202
	Triassic		250
Paleozoic	Permian		290
	Pennsylvanian		323
	Mississippian		363
	Devonian		409
	Silurian		439
	Ordovician		510
	Cambrian		544
Precambrian			4500

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