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
A. G. Sennikov and V. K. Golubev. 2006. Vyazniki Biotic Assemblage of the Terminal Permian. Paleontological Journal 40(suppl. 4):S475-S481 view
F. M. Gradstein, J. G. Ogg, M. D. Schmitz and G. M. Ogg. 2020. Geologic Time Scale 2020 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 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

Show more time

Show linear time

International Chronostratigraphic Timescale			Obsolete Names for ICS Units			Permo-Triassic Subages of Eastern Europe	Cambrian of Britain		Devonian Subages	Cambrian of Kazakhstan				Silurian of North America			Cretaceous Subepochs	Ordovician of Britain
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																	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				Vokhmian													247.2
	Early Triassic	Induan				Vokhmian													251.2
Permian	Lopingian	Changhsingian																	251.902
	Lopingian	Wuchiapingian		Longtanian †		Late Vyatkian/Early Vyatkian													254.14
	Guadalupian	Capitanian				Late Severodvinian/Early Severodvinian													259.51
		Wordian				Late Urzhumian/Early Urzhumian													264.28
		Roadian				Late Kazanian/Early Kazanian													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	Gleedonian	427.4
		Homerian					Lockportian	Whitwellian	429.7 *
		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	Harju						Porkuni		Ashgill	Hirnantian	443.8
		Katian							Pirgu			Rawtheyan	445.2
												Cautleyan	448.9 *
												Pusgillian	449.3 *
									Vormsi		Caradoc	Streffordian	Onnian †	449.6 *
									Nabala					Johvi †	450 *
			Viru						Rakvere						450.6 *
									Rakvere			Cheneyan			451.5 *
									Oandu			Cheneyan			452 *
									Oandu			Burrellian			452.7 *
		Sandbian							Keila					Idavere †	453
									Keila				Actonian †		453.2 *
									Haljala				Actonian †		453.9
													Marshbrookian †		Woolstonian †	454.2 *
													Longvillian †			455.2 *
									Kukruse							456.4 *
												Aurelucian				456.8 *
													Soudleyan †/Harnagian/Costonian			457.4 *
									Uhaku				Soudleyan †/Harnagian/Costonian	Aluoja †		457.5 *
	Middle Ordovician	Darriwilian							Uhaku		Llanvirn	Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn				458.4
				Lasnamagi					458.9 *
				Aseri					460.4 *
				Aseri					Abereiddian/Early Llanvirn			461.3 *
			Oeland	Kunda		462.9 *
				Kunda		Valaste †/Hunderum						464.3 *
				Volkhov								Langevoja †/Vaana/Saka		467.1 *
		Dapingian												467.3
									Arenig		Fennian			468.4 *
				Billingen										469.3 *
	Early Ordovician	Floian												470
						Latorp †								470.1 *
											Whitlandian			471.1 *
				Hunneberg							Whitlandian			473.7 *
											Moridunian			474.3 *
		Tremadocian							Ungurian		Tremadoc			Migneintian		477.7
														Cressagian		480.8 *
				Varangu												481.3 *
				Pakerort												482.2 *
																485 *
Cambrian	Furongian	Stage 10				Merioneth			Dolgellian/Trempealeauan							Batyrbaian	485.4
																	486.3 *
																	486.5
									Festiniogian								489.2 *
		Jiangshanian															489.5
																Aksaian	490.7 *
																Sakian	492.2 *
									Maentwrogian								493.1 *
		Paibian							Maentwrogian								494
	Miaolingian	Guzhangian				Series 3 †			St Davids								Ayusokkanian	497
		Guzhangian																499.5
		Drumian															Zhanaarykian	500.5
		Drumian			Tuesaian												503
		Wuliuan			Tuesaian												Stage 5 †	504.5
		Wuliuan															Stage 5 †	505.3
	Series 2	Stage 4															Caerfai	509
					Toyonian													510 *
					Botomian													512.5 *
		Stage 3			Botomian			514
		Stage 3			Atdabanian			515.6 *
	Terreneuvian	Stage 2			Tommotian			521
		Stage 2						525.5
		Fortunian						529
																			538.8