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			Carboniferous Subepochs	Permian of North America		Devonian of Czechoslovakia	Cambrian Epochs	Permian of Western Europe	Cambrian of North America		Devonian Subages
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													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 †							Zechstein				254.14
	Guadalupian	Capitanian					Capitanian				Rotliegendes				259.51
		Wordian					Wordian								264.28
		Roadian					Roadian								266.9
	Cisuralian	Kungurian					Leonardian	Cathedralian							273.01
		Kungurian						Hessian							281.9 *
		Artinskian						Hessian			Autunian				283.5
		Artinskian					Wolfcampian	Lenoxian							286.1 *
		Sakmarian						Lenoxian							290.1
		Asselian						Nealian							293.52
Carboniferous	Pennsylvanian	Gzhelian				Late Pennsylvanian									298.9
		Kasimovian				Late Pennsylvanian									303.7
		Moscovian				Middle Pennsylvanian									307
		Bashkirian				Early Pennsylvanian									315.2
	Mississippian	Serpukhovian				Late Mississippian									323.2
		Visean				Middle Mississippian									330.9
		Tournaisian			Early Mississippian	346.7
Devonian	Late Devonian	Famennian				Late Famennian			358.9
						Middle Famennian			365.3 *
						Early Famennian			368.5 *
		Frasnian				Late Frasnian			372.2
						Middle Frasnian			375.4 *
						Early Frasnian			379.3 *
	Middle Devonian	Givetian				Srbsko			Late Givetian	382.7
									Middle Givetian	383.7 *
									Early Givetian	385.9 *
		Eifelian				Chotec			Late Eifelian	387.7
		Eifelian				Chotec			Early Eifelian	390.3 *
	Early Devonian	Emsian				Daleje/Zlichovian			Late Emsian	393.3
		Emsian				Daleje/Zlichovian			Early Emsian	398.3 *
		Pragian				Pragian			Pragian	407.6
		Lochkovian				Lochkovian			Late Lochkovian	410.8
									Middle Lochkovian	412.8 *
			Early Lochkovian						415.6 *
Silurian	Pridoli								419.2
	Ludlow	Ludfordian							423
	Ludlow	Gorstian							425.6
	Wenlock	Homerian							427.4
	Wenlock	Sheinwoodian							430.5
	Llandovery	Telychian							433.4
		Aeronian							438.5
		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							Late Cambrian	Franconian †/Dresbachian/Millardan		485.4
		Stage 10										Sunwaptan	487.5
		Jiangshanian										Sunwaptan	489.5
		Jiangshanian										Steptoean	493 *
		Paibian										Steptoean	494
	Miaolingian	Guzhangian							Series 3 †	Middle Cambrian		Marjumian	Albertian †	497
		Drumian										Marjumian		500.5
		Wuliuan		Stage 5 †								Topazan		504.5
		Wuliuan		Stage 5 †								Delamaran		506.5
	Series 2	Stage 4								Early Cambrian		Delamaran	Waucoban †	509
		Stage 4										Dyeran		511 *
		Stage 3										Dyeran		514
												Montezuman		514.8 *
												Begadean		519.9 *
	Terreneuvian	Stage 2												521
	Terreneuvian	Fortunian												529
															538.8