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
B. D. Webby. 1998. Steps toward a global standard for Ordovician stratigraphy. Newsletters in Stratigraphy 36:1-33 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					Ordovician of China			Devonian Subages	Precambrian of Russia	Ordovician of Ibero-Bohemia
Phanerozoic	Paleozoic	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	Hirnantian	Xiaoxita †/Shikou	Wufeng †			Kosovian				443.8
				Katian	Chientangkiangian		Wufeng †			Kralodvorian	Bohdalec †			445.2
					Neichianshanian/Hanjiang					Kralodvorian				449.5
										Berounian				449.7 *
				Sandbian										453
												Zahorany †/Vinice	Letna †	456.2 *
											Liben †			458 *
			Middle Ordovician	Darriwilian	Darriwilian	Guniu †/Hulo								458.4
										Dobrotivian				458.5 *
										Oretanian				459.7 *
											Sarka †			461.7 *
						Hunjiang †	Dawan †/Daobaowan/Ningkuo				Sarka †			466.3 *
				Dapingian	Dapingian						Klabava †			467.3
				Dapingian	Dapingian					Arenigian				468
			Early Ordovician	Floian	Yiyangian					Arenigian				470
				Tremadocian	Xinchangian					Tremadocian				477.7
				Tremadocian	Xinchangian		Lianghekou †			Tremadocian				477.9 *
		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