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			Devonian of Czechoslovakia	Permian of the Pamirs	Devonian of Eastern North America		Ordovician of Britain			Silurian of England		Cambrian Epochs	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																		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										251.902
	Lopingian	Wuchiapingian		Longtanian †						Dzhulfian										254.14
	Guadalupian	Capitanian								Midian										259.51
		Wordian								Midian										264.28
		Wordian								Murgabian										266.2 *
		Roadian								Murgabian										266.9
	Cisuralian	Kungurian								Kubergandian										273.01
		Kungurian								Bolorian										279.8
		Artinskian								Bolorian										283.5
		Artinskian								Yakhtashian										286
		Sakmarian								Sakmarian										290.1
		Asselian								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			Conewangan/Conneautan/Canadaway	358.9
	Late Devonian	Frasnian			West Fallsian/Sonyean	372.2
	Middle Devonian	Givetian			Srbsko	Geneseean/Taghanican/Tioughniogan	Cazenovian	382.7
	Middle Devonian	Eifelian			Chotec	Southwoodian	Cazenovian	387.7
	Early Devonian	Emsian			Daleje/Zlichovian	Sawkillian/Deer Parkian	Helderbergian	393.3
		Pragian			Pragian			407.6
		Lochkovian			Lochkovian			410.8
Silurian	Pridoli							Red Downtonian/Temeside Shales/Downton Castle	Whitcliffe/Leintwardine		419.2
	Pridoli							Red Downtonian/Temeside Shales/Downton Castle	Bringewood/Elton		421.3
	Ludlow	Ludfordian						Coalbrookdale	Wenlock (England)/Tickwood		423
		Gorstian									425.6
		Gorstian							Buildwas		426.4 *
	Wenlock	Homerian							Buildwas		427.4
		Homerian						Wych	Woolhope		428.4 *
		Sheinwoodian	430.5
	Llandovery	Telychian	433.4
		Telychian							436.3 *
		Aeronian							438.5
		Aeronian						Cowleigh Park	439.3 *
		Rhuddanian						Cowleigh Park	440.8
Ordovician	Late Ordovician	Hirnantian						Hirnantian	Xiaoxita †/Shikou		Wufeng †	Ashgill	Hirnantian	443.8
		Katian						Chientangkiangian					Rawtheyan	445.2
													Cautleyan	448.9 *
													Pusgillian	449.3 *
								Neichianshanian/Hanjiang					Pusgillian	449.5
												Caradoc	Streffordian	Onnian †	449.6 *
													Cheneyan		451.5 *
													Burrellian		452.7 *
		Sandbian													453
														Actonian †	453.2 *
														Marshbrookian †	Woolstonian †	454.2 *
														Longvillian †		455.2 *
													Aurelucian	Longvillian †		456.8 *
													Aurelucian	Soudleyan †/Harnagian/Costonian		457.4 *
	Middle Ordovician	Darriwilian						Darriwilian	Guniu †/Hulo			Llanvirn	Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn			458.4
									Guniu †/Hulo				Abereiddian/Early Llanvirn			461.3 *
									Hunjiang †		Dawan †/Daobaowan/Ningkuo					466.3 *
		Dapingian						Dapingian								467.3
		Dapingian						Dapingian				Arenig	Fennian			468.4 *
	Early Ordovician	Floian						Yiyangian					Fennian			470
													Whitlandian			471.1 *
													Moridunian			474.3 *
		Tremadocian						Xinchangian				Tremadoc	Migneintian			477.7
											Lianghekou †		Migneintian			477.9 *
													Cressagian			480.8 *
																485 *
Cambrian	Furongian	Stage 10									Late Cambrian					485.4
		Jiangshanian														489.5
		Paibian														494
	Miaolingian	Guzhangian									Series 3 †					Middle Cambrian	497
		Drumian															500.5
		Wuliuan															Stage 5 †	504.5
	Series 2	Stage 4															Early Cambrian	509
	Series 2	Stage 3																514
	Terreneuvian	Stage 2																521
	Terreneuvian	Fortunian																529
																				538.8