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
B. D. Webby. 1998. Steps toward a global standard for Ordovician stratigraphy. Newsletters in Stratigraphy 36:1-33 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 128370 collections

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International Chronostratigraphic Timescale					Ordovician of Britain				Precambrian of Russia	Ordovician of Ibero-Bohemia
Phanerozoic	Paleozoic	Ordovician	Late Ordovician	Hirnantian	Ashgill	Hirnantian				Kosovian				443.8
				Katian		Rawtheyan				Kralodvorian	Bohdalec †			445.2
						Cautleyan								448.9 *
						Pusgillian								449.3 *
					Caradoc	Streffordian	Onnian †							449.6 *
						Streffordian				Berounian				449.7 *
						Cheneyan								451.5 *
						Burrellian								452.7 *
				Sandbian										453
							Actonian †							453.2 *
							Marshbrookian †	Woolstonian †						454.2 *
							Longvillian †							455.2 *
												Zahorany †/Vinice	Letna †	456.2 *
						Aurelucian								456.8 *
							Soudleyan †/Harnagian/Costonian							457.4 *
							Soudleyan †/Harnagian/Costonian				Liben †			458 *
			Middle Ordovician	Darriwilian	Llanvirn	Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn								458.4
										Dobrotivian				458.5 *
										Oretanian				459.7 *
						Abereiddian/Early Llanvirn								461.3 *
											Sarka †			461.7 *
				Dapingian							Klabava †			467.3
										Arenigian				468
					Arenig	Fennian								468.4 *
			Early Ordovician	Floian		Fennian								470
						Whitlandian								471.1 *
						Moridunian								474.3 *
				Tremadocian	Tremadoc	Migneintian				Tremadocian				477.7
					Tremadoc	Cressagian								480.8 *
														485 *
		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