PBDB Timescale

Obsolete Names for ICS Units

The interval definitions in this timescale are derived from the following sources:

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
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
F. M. Gradstein, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 view
J. Palfy, P. L. Smith, and J. K. Mortensen. 2000. A U-Pb and 40Ar/39Ar time scale for the Jurassic. Canadian Journal of Earth Sciences 37(6):923-944 view
B. D. Webby. 1998. Steps toward a global standard for Ordovician stratigraphy. Newsletters in Stratigraphy 36:1-33 view

There are 55 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 92 collections

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International Chronostratigraphic Timescale			Obsolete Names for ICS Units			Ordovician of Ibero-Bohemia				Devonian Subages	Silurian of North America			Cambrian of West Avalonia	Ammonite Chrons of North America			Cambrian of China		Ordovician of Britain
Quaternary	Holocene	Meghalayan																			0
		Northgrippian																			0.0042
		Greenlandian																			0.0082
	Pleistocene	Late Pleistocene																			0.0117
		Chibanian																			0.129
		Calabrian																			0.774
		Gelasian																			1.8
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
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													Epizigzagiceras						168.2
		Bajocian													Rotundum/Oblatum/Kirschneri/Crassicostatus/Widebayense						168.4
		Aalenian													Howelli/Scissum/Westermanni						170.9
	Early Jurassic	Toarcian													Yakounensis/Hillebrandti/Crassicosta						174.7
															Planulata						179.3 *
															Planulata		Arnioceras arnouldi				179.8 *
															Kanense						181.3 *
															Carlottense						182.3 *
															Kunae						183.5 *
		Pliensbachian													Kunae						184.2
															Freboldi						185.1 *
															Whiteavesi/Imlayi	Tetraspidoceras					186.2 *
																Tetraspidoceras					189.2 *
															Plesechioceras harbledownense/Asteroceras varians/Coroniceras	Canadensis					190.3 *
		Sinemurian																			192.9
															Pseudaetomoceras		Psiloceras				196.4 *
															Franziceras/Euphyllites						196.5 *
		Hettangian													Franziceras/Euphyllites						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
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			298.9
		Kasimovian			303.7
		Moscovian			307
		Bashkirian			315.2
	Mississippian	Serpukhovian			323.2
		Visean			330.9
		Tournaisian			346.7
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	Late Givetian		382.7
			Middle Givetian		383.7 *
			Early Givetian		385.9 *
		Eifelian	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
		Lochkovian	Late Lochkovian		410.8
			Middle Lochkovian		412.8 *
			Early Lochkovian		415.6 *
Silurian	Pridoli				Cayugan	419.2
	Pridoli				Niagaran	422.5 *
	Ludlow	Ludfordian				423
	Ludlow	Gorstian				425.6
	Wenlock	Homerian				Lockportian	427.4
	Wenlock	Sheinwoodian					430.5
	Llandovery	Telychian				Ontarian	433.4
		Aeronian					438.5
							Alexandrian	438.7 *
					Medinan	Clinton		440.1 *
								440.7 *
		Rhuddanian						440.8
Ordovician	Late Ordovician	Hirnantian			Kosovian				Ashgill	Hirnantian	443.8
		Katian			Kralodvorian					Bohdalec †	Rawtheyan	445.2
											Cautleyan	448.9 *
											Pusgillian	449.3 *
									Caradoc		Streffordian	Onnian †	449.6 *
					Berounian						Streffordian		449.7 *
											Cheneyan		451.5 *
											Burrellian		452.7 *
		Sandbian											453
												Actonian †	453.2 *
												Marshbrookian †	Woolstonian †	454.2 *
												Longvillian †		455.2 *
														Zahorany †/Vinice	Letna †	456.2 *
											Aurelucian					456.8 *
												Soudleyan †/Harnagian/Costonian				457.4 *
										Liben †		Soudleyan †/Harnagian/Costonian				458 *
	Middle Ordovician	Darriwilian							Llanvirn		Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn					458.4
					Dobrotivian											458.5 *
					Oretanian											459.7 *
											Abereiddian/Early Llanvirn					461.3 *
										Sarka †						461.7 *
		Dapingian		Klabava †						467.3
					Arenigian					468
									Arenig	Fennian	468.4 *
	Early Ordovician	Floian								Fennian	470
										Whitlandian	471.1 *
										Moridunian	474.3 *
		Tremadocian		Tremadocian					Tremadoc	Migneintian	477.7
									Tremadoc	Cressagian	480.8 *
											485 *
Cambrian	Furongian	Stage 10									Niuchehean					Taoyuanian †	485.4
		Jiangshanian									Jiangshanian						489.5
		Paibian									Paibian						494
		Paibian									Paibian					Waergangian †/Youshuanian	494.9 *
	Miaolingian	Guzhangian									Series 3 †					Guzhangian	Wangcunian †	497
		Guzhangian														Guzhangian		Arcadian	498.4
		Drumian														Drumian			500.5
		Wuliuan														Stage 5 †	Wuliuan/Taijangian			504.5
	Series 2	Stage 4															Branchian	Duyunian		509
		Stage 3															Branchian	Nangaoian		514
		Stage 3															Placentian	Nangaoian		517.1
	Terreneuvian	Stage 2																Meishucunian		521
		Fortunian																Meishucunian		529
		Fortunian																Jinnigian		530.7
																					538.8