Geologic Timescale | Research & Encyclopedia Articles

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Geologic Timescale

Era	Period		Epoch	started (millions of years ago)
Cenozoic 66.4 millions of years ago-present time			Quaternary		Holocene	0.01
			Quaternary		Pleistocene	1.6
	Tertiary	Neogene	Pliocene	5.3
		Miocene	Pliocene	5.3	23.7
		Paleogene	Oligocene	36.6
			Eocene	57.8
			Paleocene	66.4
Mesozoic 245-66.4 millions of years ago	Cretaceous		Late	97.5
	Cretaceous		Early	144
	Jurassic		Late	163
			Middle	187
			Early	208
	Triassic		Late	230
			Middle	240
			Early	245
Paleozoic 570-245 millions of years ago	Permian		Late	258
			Early	286
			Carboniferous	Pennsylvanian	Late	320
	Mississippian	Early	360	Pennsylvanian
	Devonian		Late	374
			Middle	387
			Early	408
	Silurian		Late	421
			Early	438
			Ordovician		Late	458
	Middle	478
	Early	505
	Cambrian		Late	523
			Middle	540
			Early	570
Precambrian time 4500-570 millions of years ago				4500

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