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

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			Permian of North America		Silurian of England		Cenozoic Subepochs	Cambrian of Kazakhstan
Quaternary	Pleistocene	Late Pleistocene								Late Pleistocene		0.0117
		Chibanian								Middle Pleistocene		0.129
		Calabrian								Early Pleistocene		0.774
		Gelasian								Early Pleistocene		1.8
Neogene	Pliocene	Piacenzian	Tertiary †							Late Pliocene		2.58
	Pliocene	Zanclean								Early Pliocene		3.6
	Miocene	Messinian								Late Miocene		5.333
		Tortonian								Late Miocene		7.246
		Serravallian								Middle Miocene		11.63
		Langhian								Middle Miocene		13.82
		Burdigalian								Early Miocene		15.98
		Aquitanian								Early Miocene		20.44
Paleogene	Oligocene	Chattian								Late Oligocene		23.03
	Oligocene	Rupelian								Early Oligocene		27.82
	Eocene	Priabonian								Late Eocene		33.9
		Bartonian								Middle Eocene		37.71
		Lutetian								Middle Eocene		41.2
		Ypresian								Early Eocene		47.8
	Paleocene	Thanetian								Late Paleocene		56
		Selandian								Middle Paleocene		59.2
		Danian								Early Paleocene		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										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			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	Gleedonian		427.4
					Wych			Woolhope	Gleedonian		428.4 *
									Whitwellian		429.7 *
		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						443.8
		Katian						445.2
		Sandbian						453
	Middle Ordovician	Darriwilian						458.4
	Middle Ordovician	Dapingian						467.3
	Early Ordovician	Floian						470
	Early Ordovician	Tremadocian						Ungurian		477.7
Cambrian	Furongian	Stage 10						Batyrbaian		485.4
		Jiangshanian						Batyrbaian		489.5
								Aksaian		490.7 *
								Sakian		492.2 *
		Paibian						Sakian		494
	Miaolingian	Guzhangian						Series 3 †		Ayusokkanian	497
		Guzhangian									499.5
		Drumian								Zhanaarykian	500.5
		Drumian								Tuesaian	503
		Wuliuan		Stage 5 †						Tuesaian	504.5
		Wuliuan		Stage 5 †							505.3
	Series 2	Stage 4									509
										Toyonian	510 *
										Botomian	512.5 *
		Stage 3								Botomian	514
		Stage 3								Atdabanian	515.6 *
	Terreneuvian	Stage 2								Tommotian	521
												525.5