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

Show more time

Show linear time

International Chronostratigraphic Timescale			Obsolete Names for ICS Units			Cambrian of West Avalonia	Silurian of the Baltic	Permian of the Pamirs	Devonian of Eastern North America		Ordovician of Britain				Silurian of England		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			Geneseean/Taghanican/Tioughniogan	Cazenovian	382.7
	Middle Devonian	Eifelian			Southwoodian	Cazenovian	387.7
	Early Devonian	Emsian			Sawkillian/Deer Parkian	Helderbergian	393.3
		Pragian					407.6
		Lochkovian					410.8
Silurian	Pridoli					Ohesaare			Red Downtonian/Temeside Shales/Downton Castle	Whitcliffe/Leintwardine	419.2
						Ohesaare				Bringewood/Elton	421.3
						Kaugetuma				Bringewood/Elton	421.7 *
	Ludlow	Ludfordian				Kuressaare			Coalbrookdale	Wenlock (England)/Tickwood	423
		Ludfordian				Paadla				Wenlock (England)/Tickwood	423.4 *
		Gorstian									425.6
		Gorstian								Buildwas	426.4 *
	Wenlock	Homerian	Rootsikula			427.4				Buildwas
			Rootsikula			Wych			Woolhope	428.4 *
			Jaagarahu							429.2 *
		Sheinwoodian	Jaagarahu							430.5
		Sheinwoodian	Jaani							431.8 *
	Llandovery	Telychian	Jaani							433.4
			Adavere							434 *
										436.3 *
		Aeronian								438.5
						Cowleigh Park				439.3 *
			Raikkula							439.4 *
		Rhuddanian	Raikkula							440.8
		Rhuddanian	Juuru							441.4 *
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
		Guzhangian													Arcadian	498.4
		Drumian														500.5
		Wuliuan						Stage 5 †								504.5
	Series 2	Stage 4												Branchian	Early Cambrian	509
		Stage 3												Branchian		514
		Stage 3												Placentian		517.1
	Terreneuvian	Stage 2														521
	Terreneuvian	Fortunian														529
																		538.8