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, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 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					Silurian of North America			Carboniferous of Western Europe		Devonian of Czechoslovakia	Ordovician of China			Devonian Subages	Ordovician of Ibero-Bohemia
Phanerozoic	Paleozoic	Permian	Cisuralian	Asselian				Kuzel											297.7
		Carboniferous	Pennsylvanian	Gzhelian				Kuzel											298.9
								Stephanian	Stephanian C										300.3 *
									Stephanian B										300.9 *
									Stephanian A										301.4 *
				Kasimovian					Stephanian A										303.7
				Kasimovian					Cantabrian										305 *
				Moscovian					Cantabrian										307
								Westphalian	Westphalian D										307.4 *
									Westphalian C										309.8
									Westphalian B										314.6
				Bashkirian					Westphalian B										315.2
									Westphalian A										317 *
								Namurian	Yeadonian										318.8 *
									Marsdenian										320.2 *
									Kinderscoutian										321.5 *
									Alportian										322 *
									Chokierian										323.1 *
			Mississippian	Serpukhovian					Chokierian										323.2
									Arnsbergian										324 *
									Pendleian										327.4 *
				Visean				Warnantian	Brigantian †										330.9
								Livian	Asbian †										336.3 *
								Moliniacian	Holkerian †/Arundian/Chadian										340.2 *
				Tournaisian				Ivorian											346.7
				Tournaisian				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						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		Cayugan														419.2
			Pridoli		Niagaran														422.5 *
			Ludlow	Ludfordian															423
			Ludlow	Gorstian															425.6
			Wenlock	Homerian		Lockportian													427.4
			Wenlock	Sheinwoodian															430.5
			Llandovery	Telychian		Ontarian													433.4
				Aeronian															438.5
							Alexandrian												438.7 *
					Medinan	Clinton													440.1 *
																			440.7 *
				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 *
	Sarka †											Hunjiang †	Dawan †/Daobaowan/Ningkuo		466.3 *
	Dapingian			Dapingian							Klabava †				467.3
Arenigian	Dapingian			Dapingian											468
Arenigian	Early Ordovician		Floian	Yiyangian											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							1200									Yurmatian
		Ectasian							Burzyan									1375
																			1400