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

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 Britain		Cenozoic Subepochs	Silurian of North America
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				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						443.8
		Katian						445.2
		Sandbian						453
	Middle Ordovician	Darriwilian						458.4
	Middle Ordovician	Dapingian						467.3
	Early Ordovician	Floian						470
	Early Ordovician	Tremadocian						477.7
Cambrian	Furongian	Stage 10						Merioneth	Dolgellian/Trempealeauan	485.4
		Stage 10							Festiniogian	489.2 *
		Jiangshanian							Festiniogian	489.5
		Jiangshanian							Maentwrogian	493.1 *
		Paibian							Maentwrogian	494
	Miaolingian	Guzhangian						Series 3 †	St Davids		497
		Drumian									500.5
		Wuliuan		Stage 5 †							504.5
	Series 2	Stage 4							Caerfai		509
	Series 2	Stage 3									514
	Terreneuvian	Stage 2									521
	Terreneuvian	Fortunian									529
												538.8