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 127017 collections

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International Chronostratigraphic Timescale					Devonian Subages	Carboniferous of China	Devonian of Czechoslovakia	Carboniferous of Western Europe		Precambrian of Russia	Ordovician of China			Ordovician of Ibero-Bohemia
Phanerozoic	Paleozoic	Permian	Cisuralian	Asselian				Kuzel										297.7
		Carboniferous	Pennsylvanian	Gzhelian														298.9
						Xiaodushanian												300 *
								Stephanian	Stephanian C									300.3 *
									Stephanian B									300.9 *
									Stephanian A									301.4 *
				Kasimovian					Stephanian A									303.7
									Cantabrian									305 *
						Dalaun												305.8 *
				Moscovian														307
								Westphalian	Westphalian D									307.4 *
									Westphalian C									309.8
									Westphalian B									314.6
				Bashkirian					Westphalian B									315.2
									Westphalian A									317 *
						Huashibanian			Westphalian A									318.5 *
								Namurian	Yeadonian									318.8 *
									Marsdenian									320.2 *
						Lousuan			Marsdenian									321.2 *
									Kinderscoutian									321.5 *
									Alportian									322 *
									Chokierian									323.1 *
			Mississippian	Serpukhovian		Dewunian			Chokierian									323.2
									Arnsbergian									324 *
									Pendleian									327.4 *
						Shangsian			Pendleian									330.8 *
				Visean		Shangsian		Warnantian	Brigantian †									330.9
						Jiusian		Warnantian	Brigantian †									335 *
								Livian	Asbian †									336.3 *
								Moliniacian	Holkerian †/Arundian/Chadian									340.2 *
				Tournaisian		Tangbagouan		Ivorian										346.7
				Tournaisian		Tangbagouan		Hastarian										353.7 *
		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		Srbsko											382.7
					Middle Givetian													383.7 *
					Early Givetian													385.9 *
				Eifelian	Late Eifelian		Chotec											387.7
				Eifelian	Early Eifelian		Chotec											390.3 *
			Early Devonian	Emsian	Late Emsian		Daleje/Zlichovian											393.3
				Emsian	Early Emsian		Daleje/Zlichovian											398.3 *
				Pragian	Pragian		Pragian											407.6
				Lochkovian	Late Lochkovian		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 †							Sarka †		Dawan †/Daobaowan/Ningkuo	466.3 *
	Dapingian		Dapingian								Klabava †			467.3
	Dapingian		Dapingian							Arenigian				468
Early Ordovician	Floian		Yiyangian							Arenigian				470
	Tremadocian		Xinchangian							Tremadocian				477.7
	Tremadocian		Xinchangian							Tremadocian			Lianghekou †	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