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
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			Permian of the Pamirs	Permian of China	Silurian of North America			Ordovician of Australia	Ordovician of China			Cambrian of Britain		Cretaceous Subepochs	Cenozoic Subepochs
Quaternary	Pleistocene	Late Pleistocene																Late Pleistocene	0.0117
		Chibanian																Middle Pleistocene	0.129
		Calabrian																Early Pleistocene	0.774
		Gelasian																Early Pleistocene	1.8
Neogene	Pliocene	Piacenzian	Tertiary †															Late Pliocene	2.58
	Pliocene	Zanclean																Early Pliocene	3.6
	Miocene	Messinian																Late Miocene	5.333
		Tortonian																Late Miocene	7.246
		Serravallian																Middle Miocene	11.63
		Langhian																Middle Miocene	13.82
		Burdigalian																Early Miocene	15.98
		Aquitanian																Early Miocene	20.44
Paleogene	Oligocene	Chattian																Late Oligocene	23.03
	Oligocene	Rupelian																Early Oligocene	27.82
	Eocene	Priabonian																Late Eocene	33.9
		Bartonian																Middle Eocene	37.71
		Lutetian																Middle Eocene	41.2
		Ypresian																Early Eocene	47.8
	Paleocene	Thanetian																Late Paleocene	56
		Selandian																Middle Paleocene	59.2
		Danian																Early Paleocene	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																	247.2
	Early Triassic	Induan																	251.2
Permian	Lopingian	Changhsingian				Dorashamian	Meishanian												251.902
		Changhsingian				Dorashamian	Baoqingian												253.4 *
		Wuchiapingian		Longtanian †		Dzhulfian	Laoshanian												254.14
		Wuchiapingian		Longtanian †		Dzhulfian	Laibinian												257.7 *
	Guadalupian	Capitanian				Midian	Lengwuan												259.51
		Wordian				Midian	Kuhfengian												264.28
		Wordian				Murgabian													266.2 *
		Roadian				Murgabian													266.9
	Cisuralian	Kungurian				Kubergandian	Luodianian												273.01
		Kungurian				Bolorian													279.8
		Artinskian																	283.5
							Longlinian												285.4 *
						Yakhtashian													286
		Sakmarian			Sakmarian	290.1
		Asselian			Asselian	Zisongian	293.52
Carboniferous	Pennsylvanian	Gzhelian				Zisongian	298.9
		Gzhelian					300.1
		Kasimovian					303.7
		Moscovian					307
		Bashkirian					315.2
	Mississippian	Serpukhovian					323.2
		Visean					330.9
		Tournaisian					346.7
Devonian	Late Devonian	Famennian					358.9
	Late Devonian	Frasnian					372.2
	Middle Devonian	Givetian					382.7
	Middle Devonian	Eifelian					387.7
	Early Devonian	Emsian					393.3
		Pragian					407.6
		Lochkovian					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							Bolindian	Hirnantian	Xiaoxita †/Shikou	Wufeng †	443.8
		Katian							Bolindian	Chientangkiangian			445.2
									Eastonian	Chientangkiangian			449 *
									Eastonian	Neichianshanian/Hanjiang			449.5
									Gisbornian				452 *
		Sandbian							Gisbornian				453
	Middle Ordovician	Darriwilian							Darriwilian	Darriwilian	Guniu †/Hulo		458.4
		Darriwilian							Darriwilian	Darriwilian	Hunjiang †	Dawan †/Daobaowan/Ningkuo	466.3 *
		Dapingian							Yapeenian	Dapingian			467.3
		Dapingian							Castlemainian	Dapingian			468.5 *
	Early Ordovician	Floian							Chewtonian	Yiyangian			470
									Bendigonian				471.8 *
									Lancefieldian				473.5 *
		Tremadocian								Xinchangian			477.7
												Lianghekou †	477.9 *
									Warendian			Lianghekou †	482.8 *
Cambrian	Furongian	Stage 10											Merioneth	Dolgellian/Trempealeauan	Late Cambrian	485.4
		Stage 10												Festiniogian		489.2 *
		Jiangshanian												Festiniogian		489.5
		Jiangshanian												Maentwrogian		493.1 *
		Paibian												Maentwrogian		494
	Miaolingian	Guzhangian											Series 3 †	St Davids		Middle Cambrian	497
		Drumian															500.5
		Wuliuan		Stage 5 †													504.5
	Series 2	Stage 4												Caerfai		Early Cambrian	509
	Series 2	Stage 3															514
	Terreneuvian	Stage 2															521
	Terreneuvian	Fortunian															529
																			538.8