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, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 view
F. M. Gradstein, J. G. Ogg, M. D. Schmitz and G. M. Ogg. 2020. Geologic Time Scale 2020 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			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								259.51
		Wordian								264.28
		Roadian								266.9
	Cisuralian	Kungurian								273.01
		Artinskian								283.5
		Sakmarian								290.1
		Asselian								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