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
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

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International Chronostratigraphic Timescale			Obsolete Names for ICS Units			Ordovician of China			Permian of the Pamirs	Cambrian Epochs	Cambrian of Britain		Permian 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												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
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				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	Hirnantian		Xiaoxita †/Shikou	Wufeng †	443.8
		Katian	Chientangkiangian			Wufeng †	445.2
		Katian	Neichianshanian/Hanjiang				449.5
		Sandbian	Neichianshanian/Hanjiang				453
	Middle Ordovician	Darriwilian	Darriwilian		Guniu †/Hulo		458.4
		Darriwilian	Darriwilian		Hunjiang †	Dawan †/Daobaowan/Ningkuo	466.3 *
		Dapingian	Dapingian				467.3
	Early Ordovician	Floian	Yiyangian				470
		Tremadocian	Xinchangian				477.7
		Tremadocian	Xinchangian			Lianghekou †	477.9 *
Cambrian	Furongian	Stage 10					Late Cambrian	Merioneth		Dolgellian/Trempealeauan	485.4
		Stage 10								Festiniogian	489.2 *
		Jiangshanian								Festiniogian	489.5
		Jiangshanian								Maentwrogian	493.1 *
		Paibian								Maentwrogian	494
	Miaolingian	Guzhangian					Series 3 †	Middle Cambrian		St Davids		497
		Drumian										500.5
		Wuliuan		Stage 5 †								504.5
	Series 2	Stage 4						Early Cambrian		Caerfai		509
	Series 2	Stage 3										514
	Terreneuvian	Stage 2										521
	Terreneuvian	Fortunian										529
														538.8