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
F. M. Gradstein, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 view
F. M. Gradstein, J. G. Ogg, M. D. Schmitz and G. M. Ogg. 2020. Geologic Time Scale 2020 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

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 126778 collections

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International Chronostratigraphic Timescale					Carboniferous of North America	Obsolete Precambrian Ages		Carboniferous of China	Devonian Subages	Ordovician of Ibero-Bohemia
Phanerozoic	Paleozoic	Permian	Cisuralian	Asselian	Bursumian †									293.52
		Carboniferous	Pennsylvanian	Gzhelian	Virgilian									298.9
				Gzhelian	Virgilian			Xiaodushanian						300 *
				Kasimovian	Missourian			Xiaodushanian						303.7
					Missourian			Dalaun						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	Chesterian			Dewunian						323.2
				Serpukhovian				Shangsian						330.8 *
				Visean				Shangsian						330.9
								Jiusian						335 *
					Meramecian									335.8 *
					Osagean									343.1 *
				Tournaisian	Osagean			Tangbagouan						346.7
				Tournaisian	Kinderhookian			Tangbagouan						351.9 *
		Devonian	Late Devonian	Famennian					Late Famennian					358.9
									Middle Famennian					365.3 *
									Early Famennian					368.5 *
				Frasnian					Late Frasnian					372.2
									Middle Frasnian					375.4 *
									Early Frasnian					379.3 *
			Middle Devonian	Givetian					Late Givetian					382.7
									Middle Givetian					383.7 *
									Early Givetian					385.9 *
				Eifelian					Late Eifelian					387.7
				Eifelian					Early Eifelian					390.3 *
			Early Devonian	Emsian					Late Emsian					393.3
				Emsian					Early Emsian					398.3 *
				Pragian					Pragian					407.6
				Lochkovian					Late Lochkovian					410.8
									Middle Lochkovian					412.8 *
									Early Lochkovian					415.6 *
		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						Kosovian				443.8
				Katian						Kralodvorian	Bohdalec †			445.2
				Katian						Berounian				449.7 *
				Sandbian										453
												Zahorany †/Vinice	Letna †	456.2 *
											Liben †			458 *
			Middle Ordovician	Darriwilian										458.4
										Dobrotivian				458.5 *
										Oretanian				459.7 *
											Sarka †			461.7 *
				Dapingian							Klabava †			467.3
				Dapingian						Arenigian				468
			Early Ordovician	Floian						Arenigian				470
			Early Ordovician	Tremadocian						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 †	Poundian †							538.8
Proterozoic	Neoproterozoic	Ediacaran				Vendian †	Wonokan †							571.7 *
														635