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 Czechoslovakia	Permian of North America		Silurian of North America			Silurian Ages of Europe	Cretaceous Subepochs	Ordovician of Britain
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					Capitanian										259.51
		Wordian					Wordian										264.28
		Roadian					Roadian										266.9
	Cisuralian	Kungurian					Leonardian	Cathedralian									273.01
		Kungurian						Hessian									281.9 *
		Artinskian						Hessian									283.5
		Artinskian					Wolfcampian	Lenoxian									286.1 *
		Sakmarian						Lenoxian									290.1
		Asselian						Nealian									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					Cayugan			419.2
	Pridoli					Niagaran			422.5 *
	Ludlow	Ludfordian							423
	Ludlow	Gorstian							425.6
	Wenlock	Homerian							Lockportian	Gleedonian	427.4
		Homerian							Lockportian	Whitwellian	429.7 *
		Sheinwoodian									430.5
	Llandovery	Telychian							Ontarian		433.4
		Aeronian									438.5
			Alexandrian								438.7 *
						Medinan			Clinton		440.1 *
											440.7 *
		Rhuddanian									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													485.4
		Jiangshanian													489.5
		Paibian													494
	Miaolingian	Guzhangian													Series 3 †	497
		Drumian														500.5
		Wuliuan		Stage 5 †												504.5
																	509