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
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
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

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			Ammonite Chrons of Northwest Europe		Silurian of North America			Cambrian Epochs	Ordovician of Ibero-Bohemia				Cambrian of China		Cretaceous Subepochs	Obsolete Carboniferous Ages of China
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																Senonian		66
		Campanian																		72.1
		Santonian																		83.6
		Coniacian																		86.3
		Turonian																		89.8
		Cenomanian																		93.9
	Early Cretaceous	Albian																Gallic		100.5
		Aptian																		113
		Barremian																		121.4
		Hauterivian																Neocomian		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				Parkinsoni/Garantiana/Subfurcatum/Sauzei/Laeviuscula/Discites														168.2
		Bajocian					Humphresianum													168.4
		Aalenian				Concavum/Murchisonae/Opalinum														170.9
	Early Jurassic	Toarcian				Levesquei/Variabilis/Bifrons	Thouarsense													174.7
						Levesquei/Variabilis/Bifrons														180.1
						Serpentinum/Falciferum/Tenuicostatum														182
		Pliensbachian				Spinatum/Margaritatus/Davoei/Ibex/Jamesoni														184.2
		Sinemurian				Raricostatum/Oxynotum/Obtusum/Turneri/Semicostatum/Bucklandi														192.9
		Hettangian				Angulata/Liasicus/Planorbis														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																	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			Wocklum/Dasberg/Hemberg/Nehden			358.9
	Late Devonian	Frasnian			Adorf			372.2
	Middle Devonian	Givetian			Givetian			382.7
	Middle Devonian	Eifelian			Eifelian			387.7
	Early Devonian	Emsian			Emsian			393.3
		Pragian			Siegen			407.6
		Lochkovian			Gedinnine			410.8
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	443.8
		Katian								Kralodvorian	Bohdalec †	445.2
		Katian								Berounian		449.7 *
		Sandbian										453
												Zahorany †/Vinice	Letna †	456.2 *
											Liben †			458 *
	Middle Ordovician	Darriwilian												458.4
										Dobrotivian				458.5 *
										Oretanian				459.7 *
											Sarka †			461.7 *
		Dapingian									Klabava †			467.3
		Dapingian								Arenigian				468
	Early Ordovician	Floian								Arenigian				470
	Early Ordovician	Tremadocian								Tremadocian				477.7
Cambrian	Furongian	Stage 10								Late Cambrian					Niuchehean	Taoyuanian †	485.4
		Jiangshanian													Jiangshanian		489.5
		Paibian					Paibian								494
		Paibian					Paibian								Waergangian †/Youshuanian	494.9 *
	Miaolingian	Guzhangian					Series 3 †			Middle Cambrian					Guzhangian	Wangcunian †	497
		Drumian													Drumian	Wangcunian †	500.5
		Wuliuan		Stage 5 †											Wuliuan/Taijangian		504.5
	Series 2	Stage 4					Early Cambrian			Duyunian					509
	Series 2	Stage 3								Nangaoian					514
	Terreneuvian	Stage 2								Meishucunian					521
		Fortunian								Meishucunian					529
		Fortunian								Jinnigian					530.7
																				538.8