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, 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					Permian of the Pamirs	Devonian Subages	Precambrian of Russia	Ordovician of Ibero-Bohemia
Phanerozoic	Paleozoic	Permian	Lopingian	Changhsingian	Dorashamian							251.902
			Lopingian	Wuchiapingian	Dzhulfian							254.14
			Guadalupian	Capitanian	Midian							259.51
				Wordian	Midian							264.28
				Wordian	Murgabian							266.2 *
				Roadian	Murgabian							266.9
			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
				Kasimovian								303.7
				Moscovian								307
				Bashkirian								315.2
			Mississippian	Serpukhovian								323.2
				Visean								330.9
				Tournaisian								346.7
		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					538.8
		Cryogenian										635
		Tonian										720
		Tonian					Karatau					800
	Mesoproterozoic	Stenian					Karatau					1000
		Stenian					Yurmatian					1100
		Ectasian					Yurmatian					1200
		Ectasian					Burzyan					1375
												1400