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
F. M. Gradstein, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 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 126844 collections

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International Chronostratigraphic Timescale					Cambrian of China		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							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	Niuchehean	Taoyuanian †										485.4
				Jiangshanian	Jiangshanian											489.5
				Paibian	Paibian											494
				Paibian	Paibian	Waergangian †/Youshuanian										494.9 *
			Miaolingian	Guzhangian	Guzhangian	Wangcunian †										497
				Drumian	Drumian	Wangcunian †										500.5
				Wuliuan	Wuliuan/Taijangian											504.5
			Series 2	Stage 4	Duyunian											509
			Series 2	Stage 3	Nangaoian											514
			Terreneuvian	Stage 2	Meishucunian											521
				Fortunian	Meishucunian											529
				Fortunian	Jinnigian											530.7
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