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 126973 collections

Show more time

Show linear time

International Chronostratigraphic Timescale					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														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		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 *
				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