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			Devonian of France	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			Famennian	Conewangan/Conneautan/Canadaway	358.9
	Late Devonian	Frasnian			Frasnian	West Fallsian/Sonyean	372.2
	Middle Devonian	Givetian			Givetian	Srbsko	Geneseean/Taghanican/Tioughniogan		Cazenovian	382.7
	Middle Devonian	Eifelian			Couvinien	Chotec	Southwoodian		Cazenovian	387.7
	Early Devonian	Emsian				Daleje/Zlichovian	Sawkillian/Deer Parkian		Helderbergian	393.3
		Pragian				Pragian				407.6
		Pragian			Coblencien	Pragian				408.2 *
		Lochkovian			Gedinnine	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	Ashgill								Hirnantian		443.8
		Katian									Rawtheyan		445.2
											Cautleyan		448.9 *
											Pusgillian		449.3 *
			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	Llanvirn								Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn				458.4
		Darriwilian									Abereiddian/Early Llanvirn				461.3 *
		Dapingian									Abereiddian/Early Llanvirn				467.3
		Dapingian	Arenig								Fennian				468.4 *
	Early Ordovician	Floian									Fennian				470
											Whitlandian				471.1 *
											Moridunian				474.3 *
		Tremadocian	Tremadoc								Migneintian				477.7
			Tremadoc								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