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 126848 collections

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International Chronostratigraphic Timescale					Carboniferous of Western Europe		Devonian of Czechoslovakia	Precambrian of Russia	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														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
Arenigian	468			Dapingian					Dapingian
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												Yurmatian			1200
		Ectasian												Burzyan			1375
																	1400