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 127083 collections

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International Chronostratigraphic Timescale					Carboniferous Subepochs	Ordovician of Britain				Silurian of the Baltic	Devonian of Czechoslovakia	Ordovician of Australia	Cambrian of Britain		Permian of the Pamirs	Obsolete Precambrian Ages	Cambrian of China
Phanerozoic	Paleozoic	Permian	Lopingian	Changhsingian											Dorashamian				251.902
			Lopingian	Wuchiapingian											Dzhulfian				254.14
			Guadalupian	Capitanian											Midian				259.51
				Wordian											Midian				264.28
				Wordian											Murgabian				266.2 *
				Roadian											Murgabian				266.9
			Cisuralian	Kungurian											Kubergandian				273.01
				Kungurian											Bolorian				279.8
				Artinskian											Bolorian				283.5
				Artinskian											Yakhtashian				286
				Sakmarian											Sakmarian				290.1
				Asselian											Asselian				293.52
		Carboniferous	Pennsylvanian	Gzhelian	Late Pennsylvanian														298.9
				Kasimovian	Late Pennsylvanian														303.7
				Moscovian	Middle Pennsylvanian														307
				Bashkirian	Early Pennsylvanian														315.2
			Mississippian	Serpukhovian	Late Mississippian														323.2
				Visean	Middle Mississippian														330.9
				Tournaisian	Early Mississippian														346.7
		Devonian	Late Devonian	Famennian															358.9
			Late Devonian	Frasnian															372.2
			Middle Devonian	Givetian							Srbsko								382.7
			Middle Devonian	Eifelian							Chotec								387.7
			Early Devonian	Emsian							Daleje/Zlichovian								393.3
				Pragian							Pragian								407.6
				Lochkovian							Lochkovian								410.8
		Silurian	Pridoli							Ohesaare									419.2
			Pridoli							Kaugetuma									421.7 *
			Ludlow	Ludfordian						Kuressaare									423
				Ludfordian						Paadla									423.4 *
				Gorstian						Paadla									425.6
			Wenlock	Homerian						Rootsikula									427.4
				Homerian						Jaagarahu									429.2 *
				Sheinwoodian						Jaagarahu									430.5
				Sheinwoodian						Jaani									431.8 *
			Llandovery	Telychian						Jaani									433.4
				Telychian						Adavere									434 *
				Aeronian						Adavere									438.5
				Aeronian						Raikkula									439.4 *
				Rhuddanian						Raikkula									440.8
				Rhuddanian						Juuru									441.4 *
		Ordovician	Late Ordovician	Hirnantian		Ashgill	Hirnantian					Bolindian							443.8
				Katian			Rawtheyan												445.2
							Cautleyan												448.9 *
							Cautleyan					Eastonian							449 *
							Pusgillian												449.3 *
						Caradoc	Streffordian	Onnian †											449.6 *
							Cheneyan												451.5 *
							Cheneyan					Gisbornian							452 *
							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					Darriwilian							458.4
				Darriwilian			Abereiddian/Early Llanvirn					Darriwilian							461.3 *
				Dapingian			Abereiddian/Early Llanvirn					Yapeenian							467.3
						Arenig	Fennian					Yapeenian							468.4 *
												Castlemainian							468.5 *
			Early Ordovician	Floian								Chewtonian							470
							Whitlandian					Chewtonian							471.1 *
												Bendigonian							471.8 *
Lancefieldian	473.5 *
	Moridunian						474.3 *
	Tremadocian			Tremadoc		Migneintian	477.7
						Cressagian	480.8 *
Warendian						Cressagian	482.8 *
Warendian							485 *
Cambrian	Furongian	Stage 10					Merioneth					Dolgellian/Trempealeauan	Niuchehean	Taoyuanian †		485.4
		Stage 10										Festiniogian	Niuchehean			489.2 *
		Jiangshanian										Festiniogian	Jiangshanian			489.5
		Jiangshanian										Maentwrogian	Jiangshanian			493.1 *
		Paibian											Paibian			494
		Paibian											Paibian	Waergangian †/Youshuanian		494.9 *
	Miaolingian	Guzhangian					St Davids						Guzhangian	Wangcunian †	497
		Drumian											Drumian	Wangcunian †	500.5
		Wuliuan											Wuliuan/Taijangian		504.5
	Series 2	Stage 4					Caerfai						Duyunian		509
	Series 2	Stage 3											Nangaoian		514
	Terreneuvian	Stage 2											Meishucunian		521
		Fortunian											Meishucunian		529
		Fortunian			Jinnigian								530.7
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