PBDB Timescale

International Chronostratigraphic Timescale

The interval definitions in this timescale are derived from the following sources:

K. M. Cohen, S.C. Finney, P.L. Gibbard and J.-X. Fan. 2023. The ICS International Chronostratigraphic Chart v2023/09. view
W. B. Harland, R. L. Armstrong, A. V. Cox, L. E. Craig, A. G. Smith and D. G. Smith. 1990. A Geologic Time Scale 1989. view
F. M. Gradstein, J. G. Ogg, M. D. Schmitz and G. M. Ogg. 2020. Geologic Time Scale 2020 view
F. M. Gradstein, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 view

There are 59 timescales which overlap this one. show

Interval boundaries marked with * have been interpolated based on the differences between the ages for international timescale boundaries quoted in the source and the currently accepted ages for those boundaries.

Interval names marked with † are no longer in current use.

This timescale is used in the definition of 126762 collections

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International Chronostratigraphic Timescale					Precambrian of Russia	Permian of the Pamirs	Carboniferous of China	Permian of the Salt Range	Cambrian of North America
Phanerozoic	Mesozoic	Triassic	Early Triassic	Induan				Kathwai			251.5 *
	Paleozoic	Permian	Lopingian	Changhsingian		Dorashamian		Kathwai			251.902
											252.4 *
								Chhidru			252.9 *
				Wuchiapingian		Dzhulfian		Chhidru			254.14
								Kalabagh			255 *
								Wargal			256 *
			Guadalupian	Capitanian		Midian					259.51
				Wordian							264.28
											265.3 *
								Amb			266.1 *
						Murgabian					266.2 *
				Roadian							266.9
				Roadian							270.7 *
			Cisuralian	Kungurian		Kubergandian					273.01
				Kungurian		Bolorian					279.8
				Artinskian		Bolorian					283.5
				Artinskian		Yakhtashian					286
				Sakmarian		Sakmarian					290.1
				Asselian		Asselian					293.52
		Carboniferous	Pennsylvanian	Gzhelian							298.9
				Gzhelian			Xiaodushanian				300 *
				Kasimovian			Xiaodushanian				303.7
				Kasimovian			Dalaun				305.8 *
				Moscovian							307
				Bashkirian							315.2
							Huashibanian				318.5 *
							Lousuan				321.2 *
			Mississippian	Serpukhovian			Dewunian				323.2
				Serpukhovian			Shangsian				330.8 *
				Visean			Shangsian				330.9
				Visean			Jiusian				335 *
				Tournaisian			Tangbagouan				346.7
		Devonian	Late Devonian	Famennian							358.9
			Late Devonian	Frasnian							372.2
			Middle Devonian	Givetian							382.7
			Middle Devonian	Eifelian							387.7
			Early Devonian	Emsian							393.3
				Pragian							407.6
				Lochkovian							410.8
		Silurian	Pridoli								419.2
			Ludlow	Ludfordian							423
			Ludlow	Gorstian							425.6
			Wenlock	Homerian							427.4
			Wenlock	Sheinwoodian							430.5
			Llandovery	Telychian							433.4
				Aeronian							438.5
				Rhuddanian							440.8
		Ordovician	Late Ordovician	Hirnantian							443.8
				Katian							445.2
				Sandbian							453
			Middle Ordovician	Darriwilian							458.4
			Middle Ordovician	Dapingian							467.3
			Early Ordovician	Floian							470
			Early Ordovician	Tremadocian							477.7
		Cambrian	Furongian	Stage 10						Franconian †/Dresbachian/Millardan	485.4
				Stage 10					Sunwaptan		487.5
				Jiangshanian					Sunwaptan		489.5
				Jiangshanian					Steptoean		493 *
				Paibian					Steptoean		494
			Miaolingian	Guzhangian					Marjumian	Albertian †	497
				Drumian					Marjumian		500.5
				Wuliuan					Topazan		504.5
				Wuliuan					Delamaran		506.5
Series 2			Stage 4	Waucoban †	509				Delamaran
	Dyeran		Stage 4		511 *
	Dyeran		Stage 3		514
	Montezuman				514.8 *
	Begadean				519.9 *
Terreneuvian			Stage 2		521
Terreneuvian			Fortunian		529
Proterozoic	Neoproterozoic	Ediacaran			Vendian						538.8
		Cryogenian									635
		Tonian									720
		Tonian			Karatau						800
	Mesoproterozoic	Stenian			Karatau						1000
		Stenian			Yurmatian						1100
		Ectasian			Yurmatian			1200
		Ectasian			Burzyan			1375
											1400