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			Cambrian of Kazakhstan	Ordovician of China			Cambrian of Britain		Devonian of Czechoslovakia	Cambrian of China		Cretaceous Subepochs
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														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														358.9
	Late Devonian	Frasnian			372.2
	Middle Devonian	Givetian			Srbsko	382.7
	Middle Devonian	Eifelian			Chotec	387.7
	Early Devonian	Emsian			Daleje/Zlichovian	393.3
		Pragian			Pragian	407.6
		Lochkovian			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	453			Neichianshanian/Hanjiang
	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	Ungurian					Xinchangian	477.7
		Tremadocian	Ungurian				Lianghekou †	Xinchangian	477.9 *
Cambrian	Furongian	Stage 10	Batyrbaian						Merioneth	Dolgellian/Trempealeauan	Niuchehean	Taoyuanian †	485.4
		Stage 10								Festiniogian	Niuchehean		489.2 *
		Jiangshanian									Jiangshanian		489.5
			Aksaian										490.7 *
			Sakian										492.2 *
										Maentwrogian			493.1 *
		Paibian									Paibian		494
		Paibian									Paibian	Waergangian †/Youshuanian	494.9 *
	Miaolingian	Guzhangian	Series 3 †						Ayusokkanian	St Davids		Guzhangian	Wangcunian †	497
		Guzhangian										Guzhangian		499.5
		Drumian							Zhanaarykian			Drumian		500.5
		Drumian							Tuesaian			Drumian		503
		Wuliuan		Stage 5 †					Tuesaian			Wuliuan/Taijangian		504.5
		Wuliuan		Stage 5 †								Wuliuan/Taijangian		505.3
	Series 2	Stage 4								Caerfai		Duyunian		509
									Toyonian					510 *
									Botomian					512.5 *
		Stage 3							Botomian			Nangaoian		514
		Stage 3							Atdabanian			Nangaoian		515.6 *
	Terreneuvian	Stage 2							Tommotian			Meishucunian		521
		Stage 2												525.5
		Fortunian												529
		Fortunian										Jinnigian		530.7
																538.8