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
F. M. Gradstein, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 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 128255 collections

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International Chronostratigraphic Timescale					Carboniferous of Western Europe		Obsolete Precambrian Ages		Ordovician of Britain				Cambrian of North America	Cambrian of Australia	Devonian of France
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											Famennian	358.9
			Late Devonian	Frasnian											Frasnian	372.2
			Middle Devonian	Givetian											Givetian	382.7
			Middle Devonian	Eifelian											Couvinien	387.7
			Early Devonian	Emsian												393.3
				Pragian												407.6
				Pragian											Coblencien	408.2 *
				Lochkovian											Gedinnine	410.8
		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					Ashgill	Hirnantian						443.8
				Katian						Rawtheyan						445.2
										Cautleyan						448.9 *
										Pusgillian						449.3 *
									Caradoc	Streffordian	Onnian †					449.6 *
										Cheneyan						451.5 *
										Burrellian						452.7 *
				Sandbian												453
											Actonian †					453.2 *
											Marshbrookian †	Woolstonian †				454.2 *
											Longvillian †					455.2 *
										Aurelucian	Longvillian †					456.8 *
										Aurelucian	Soudleyan †/Harnagian/Costonian					457.4 *
			Middle Ordovician	Darriwilian					Llanvirn	Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn						458.4
				Darriwilian						Abereiddian/Early Llanvirn						461.3 *
				Dapingian						Abereiddian/Early Llanvirn						467.3
				Dapingian					Arenig	Fennian						468.4 *
			Early Ordovician	Floian						Fennian						470
										Whitlandian						471.1 *
										Moridunian						474.3 *
				Tremadocian					Tremadoc	Migneintian						477.7
									Tremadoc	Cressagian						480.8 *
							485 *
		Cambrian	Furongian	Stage 10			Franconian †/Dresbachian/Millardan	Datsonian	485.4
								Payntonian	486.8 *
								Payntonian	Sunwaptan	487.5
				Jiangshanian				Iverian	Sunwaptan	489.5
				Jiangshanian				Iverian	Steptoean	493 *
				Paibian				Idamean	Steptoean	494
			Miaolingian	Guzhangian			Marjumian	Albertian †	Mindyallan	497
				Guzhangian					Boomerangian	499
				Drumian					Undillan	500.5
				Drumian					Floran	503
				Wuliuan			Topazan		Templetonian	504.5
							Delamaran		Templetonian	506.5
									Ordian	507.8 *
			Series 2	Stage 4				Waucoban †	Ordian	509
										510.8 *
							Dyeran			511 *
				Stage 3			Dyeran			514
							Montezuman			514.8 *
							Begadean			519.9 *
			Terreneuvian	Stage 2						521
			Terreneuvian	Fortunian						529
		Proterozoic	Neoproterozoic	Ediacaran						Vendian †			Poundian †	Vendian		538.8
				Ediacaran						Vendian †			Wonokan †	Vendian		571.7 *
				Cryogenian										635
				Tonian										720
				Tonian	Karatau								800
			Mesoproterozoic	Stenian	Karatau								1000
				Stenian	Yurmatian								1100
				Ectasian	Yurmatian								1200
				Ectasian	Burzyan								1375
																1400