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 126848 collections

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International Chronostratigraphic Timescale					Ordovician of the Baltic				Devonian of Czechoslovakia	Precambrian of Russia	Ordovician of China			Devonian Subages	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					Srbsko					Late Givetian					382.7
														Middle Givetian					383.7 *
														Early Givetian					385.9 *
				Eifelian					Chotec					Late Eifelian					387.7
				Eifelian					Chotec					Early Eifelian					390.3 *
			Early Devonian	Emsian					Daleje/Zlichovian					Late Emsian					393.3
				Emsian					Daleje/Zlichovian					Early Emsian					398.3 *
				Pragian					Pragian					Pragian					407.6
				Lochkovian					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	Harju	Porkuni					Hirnantian	Xiaoxita †/Shikou	Wufeng †		Kosovian				443.8
				Katian		Pirgu					Chientangkiangian		Wufeng †		Kralodvorian	Bohdalec †			445.2
						Pirgu					Neichianshanian/Hanjiang								449.5
						Vormsi													449.6 *
						Vormsi									Berounian				449.7 *
						Nabala	Johvi †												450 *
					Viru	Rakvere													450.6 *
						Oandu													452 *
				Sandbian		Keila	Idavere †												453
						Haljala													453.9
						Haljala											Zahorany †/Vinice	Letna †	456.2 *
						Kukruse													456.4 *
						Uhaku	Aluoja †												457.5 *
																Liben †			458 *
			Middle Ordovician	Darriwilian							Darriwilian	Guniu †/Hulo							458.4
															Dobrotivian				458.5 *
						Lasnamagi									Dobrotivian				458.9 *
						Lasnamagi									Oretanian				459.7 *
						Aseri													460.4 *
						Aseri										Sarka †			461.7 *
					Oeland	Kunda													462.9 *
							Valaste †/Hunderum												464.3 *
												Hunjiang †	Dawan †/Daobaowan/Ningkuo						466.3 *
						Volkhov		Langevoja †/Vaana/Saka											467.1 *
				Dapingian							Dapingian					Klabava †			467.3
															Arenigian				468
						Billingen													469.3 *
			Early Ordovician	Floian							Yiyangian								470
							Latorp †												470.1 *
						Hunneberg													473.7 *
				Tremadocian							Xinchangian				Tremadocian				477.7
													Lianghekou †						477.9 *
						Varangu													481.3 *
						Pakerort													482.2 *
		Cambrian	Furongian	Stage 10		Pakerort													485.4
																			486.3 *
																			486.5
				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