PBDB Interval

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 126689 collections

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International Chronostratigraphic Timescale					Ordovician of Britain				Devonian of France	Precambrian of Russia	Cambrian of Britain		Devonian Subages	Obsolete Carboniferous Ages of China	Obsolete Names for ICS Units
Phanerozoic	Cenozoic	Neogene	Pliocene	Piacenzian											Tertiary †		2.58
			Pliocene	Zanclean													3.6
			Miocene	Messinian													5.333
				Tortonian													7.246
				Serravallian													11.63
				Langhian													13.82
				Burdigalian													15.98
				Aquitanian													20.44
		Paleogene	Oligocene	Chattian													23.03
			Oligocene	Rupelian													27.82
			Eocene	Priabonian													33.9
				Bartonian													37.71
				Lutetian													41.2
				Ypresian													47.8
			Paleocene	Thanetian													56
				Selandian													59.2
				Danian													61.6
	Mesozoic	Cretaceous	Late Cretaceous	Maastrichtian													66
				Campanian													72.1
				Santonian													83.6
				Coniacian													86.3
				Turonian													89.8
				Cenomanian													93.9
			Early Cretaceous	Albian													100.5
				Aptian													113
				Barremian													121.4
				Hauterivian													125.77
				Valanginian													132.6
				Berriasian													139.8
		Jurassic	Late Jurassic	Tithonian													145
				Kimmeridgian													149.2
				Oxfordian													154.8
			Middle Jurassic	Callovian													161.5
				Bathonian													165.3
				Bajocian													168.2
				Aalenian													170.9
			Early Jurassic	Toarcian													174.7
				Pliensbachian													184.2
				Sinemurian													192.9
				Hettangian													199.5
		Triassic	Late Triassic	Rhaetian													201.4
				Norian													208.5
				Carnian													227
			Middle Triassic	Ladinian													237
			Middle Triassic	Anisian													242
			Early Triassic	Olenekian													247.2
			Early Triassic	Induan													251.2
	Paleozoic	Permian	Lopingian	Changhsingian													251.902
			Lopingian	Wuchiapingian												Longtanian †	254.14
			Guadalupian	Capitanian													259.51
				Wordian													264.28
				Roadian													266.9
			Cisuralian	Kungurian													273.01
				Artinskian													283.5
				Sakmarian													290.1
				Asselian													293.52
		Carboniferous	Pennsylvanian	Gzhelian										Mapingian †			298.9
				Kasimovian										Mapingian †			303.7
				Kasimovian													305.9
				Moscovian													307
				Bashkirian													315.2
			Mississippian	Serpukhovian													323.2
				Visean													330.9
				Tournaisian													346.7
Devonian		Late Devonian	Famennian	Famennian	Late Famennian	358.9
					Middle Famennian	365.3 *
					Early Famennian	368.5 *
			Frasnian	Frasnian	Late Frasnian	372.2
					Middle Frasnian	375.4 *
					Early Frasnian	379.3 *
		Middle Devonian	Givetian	Givetian	Late Givetian	382.7
					Middle Givetian	383.7 *
					Early Givetian	385.9 *
			Eifelian	Couvinien	Late Eifelian	387.7
			Eifelian		Early Eifelian	390.3 *
		Early Devonian	Emsian		Late Emsian	393.3
			Emsian		Early Emsian	398.3 *
			Pragian		Pragian	407.6
			Pragian	Coblencien	Pragian	408.2 *
			Lochkovian	Gedinnine	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			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
	Cressagian					Tremadoc	480.8 *
							485 *
Cambrian		Furongian	Stage 10				Merioneth			Dolgellian/Trempealeauan	485.4
			Stage 10							Festiniogian	489.2 *
			Jiangshanian							Festiniogian	489.5
			Jiangshanian							Maentwrogian	493.1 *
			Paibian							Maentwrogian	494
		Miaolingian	Guzhangian				St Davids				Series 3 †	497
			Drumian									500.5
			Wuliuan									Stage 5 †	504.5
		Series 2	Stage 4				Caerfai						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