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 127017 collections

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International Chronostratigraphic Timescale					Obsolete Carboniferous Ages of China	Carboniferous of China	Devonian of Czechoslovakia	Carboniferous of Western Europe		Precambrian of Russia	Ordovician of China			Devonian Subages	Ordovician of Ibero-Bohemia
Phanerozoic	Paleozoic	Permian	Cisuralian	Asselian				Kuzel											297.7
		Carboniferous	Pennsylvanian	Gzhelian	Mapingian †														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 *
																			305.9
				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			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							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
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