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	Cretaceous Subepochs	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					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												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			358.9
	Late Devonian	Frasnian			372.2
	Middle Devonian	Givetian			382.7
	Middle Devonian	Eifelian			387.7
	Early Devonian	Emsian			393.3
		Pragian			407.6
		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	Ungurian		Tremadoc					Migneintian	477.7
					Tremadoc					Cressagian	480.8 *
											485 *
Cambrian	Furongian	Stage 10	Batyrbaian								Late Cambrian	485.4
		Jiangshanian	Batyrbaian									489.5
			Aksaian									490.7 *
			Sakian									492.2 *
		Paibian	Sakian									494
	Miaolingian	Guzhangian	Series 3 †								Ayusokkanian	Middle Cambrian	497
		Guzhangian									499.5
		Drumian		Zhanaarykian							500.5
		Drumian		Tuesaian							503
		Wuliuan		Tuesaian							Stage 5 †		504.5
		Wuliuan									Stage 5 †		505.3
	Series 2	Stage 4										Early Cambrian	509
				Toyonian									510 *
				Botomian									512.5 *
		Stage 3		Botomian									514
		Stage 3		Atdabanian									515.6 *
	Terreneuvian	Stage 2		Tommotian									521
		Stage 2											525.5
		Fortunian											529
															538.8