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					Devonian of Germany	Silurian Ages of Europe	Carboniferous of China	Permian of the Salt Range	Precambrian of Russia	Carboniferous of North America
Phanerozoic	Mesozoic	Triassic	Early Triassic	Induan				Kathwai			251.5 *
	Paleozoic	Permian	Lopingian	Changhsingian				Kathwai			251.902
											252.4 *
								Chhidru			252.9 *
				Wuchiapingian				Chhidru			254.14
								Kalabagh			255 *
								Wargal			256 *
			Guadalupian	Capitanian							259.51
				Wordian							264.28
											265.3 *
								Amb			266.1 *
				Roadian				Amb			266.9
				Roadian							270.7 *
			Cisuralian	Kungurian							273.01
				Artinskian							283.5
				Sakmarian							290.1
				Asselian						Bursumian †	293.52
		Carboniferous	Pennsylvanian	Gzhelian						Virgilian	298.9
				Gzhelian			Xiaodushanian			Virgilian	300 *
				Kasimovian			Xiaodushanian			Missourian	303.7
							Dalaun			Missourian	305.8 *
										Desmoinesian	305.9 *
				Moscovian						Desmoinesian	307
				Moscovian						Atokan	312.7 *
				Bashkirian						Atokan	315.2
										Morrowan	318.4 *
							Huashibanian				318.5 *
							Lousuan				321.2 *
			Mississippian	Serpukhovian			Dewunian			Chesterian	323.2
				Serpukhovian			Shangsian				330.8 *
				Visean			Shangsian				330.9
							Jiusian				335 *
										Meramecian	335.8 *
										Osagean	343.1 *
				Tournaisian			Tangbagouan			Osagean	346.7
				Tournaisian			Tangbagouan			Kinderhookian	351.9 *
		Devonian	Late Devonian	Famennian	Wocklum/Dasberg/Hemberg/Nehden						358.9
			Late Devonian	Frasnian	Adorf						372.2
			Middle Devonian	Givetian	Givetian						382.7
			Middle Devonian	Eifelian	Eifelian						387.7
			Early Devonian	Emsian	Emsian						393.3
				Pragian	Siegen						407.6
				Lochkovian	Gedinnine						410.8
		Silurian	Pridoli								419.2
			Ludlow	Ludfordian							423
			Ludlow	Gorstian							425.6
			Wenlock	Homerian		Gleedonian					427.4
				Homerian		Whitwellian					429.7 *
				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							485.4
				Jiangshanian							489.5
				Paibian							494
			Miaolingian	Guzhangian							497
				Drumian							500.5
Wuliuan				504.5
Series 2	Stage 4		509
Series 2	Stage 3		514
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