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

Show more time

Show linear time

International Chronostratigraphic Timescale			Obsolete Names for ICS Units			Cambrian of West Avalonia	Ordovician of Australia	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	Bolindian		Ashgill		Hirnantian		443.8
		Katian					Rawtheyan		445.2
							Cautleyan		448.9 *
			Eastonian				Cautleyan		449 *
							Pusgillian		449.3 *
					Caradoc		Streffordian		Onnian †	449.6 *
							Cheneyan			451.5 *
			Gisbornian				Cheneyan			452 *
							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		Llanvirn		Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn			458.4
		Darriwilian	Darriwilian				Abereiddian/Early Llanvirn			461.3 *
		Dapingian	Yapeenian				Abereiddian/Early Llanvirn			467.3
			Yapeenian		Arenig		Fennian			468.4 *
			Castlemainian							468.5 *
	Early Ordovician	Floian	Chewtonian							470
			Chewtonian				Whitlandian			471.1 *
			Bendigonian							471.8 *
			Lancefieldian							473.5 *
							Moridunian			474.3 *
		Tremadocian			Ungurian		Tremadoc			Migneintian	477.7
										Cressagian	480.8 *
			Warendian							Cressagian	482.8 *
			Warendian								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
					Ayusokkanian							Arcadian	498.4
													499.5
		Drumian			Zhanaarykian								500.5
		Drumian			Tuesaian								503
		Wuliuan			Tuesaian								Stage 5 †	504.5
		Wuliuan											Stage 5 †	505.3
	Series 2	Stage 4										Branchian	Early Cambrian	509
					Toyonian									510 *
					Botomian									512.5 *
		Stage 3			Botomian									514
					Atdabanian									515.6 *
					Atdabanian							Placentian		517.1
	Terreneuvian	Stage 2			Tommotian									521
		Stage 2												525.5
		Fortunian												529
																538.8