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
J. Palfy, P. L. Smith, and J. K. Mortensen. 2000. A U-Pb and 40Ar/39Ar time scale for the Jurassic. Canadian Journal of Earth Sciences 37(6):923-944 view
F. M. Gradstein, F. P. Agterberg, J. G. Ogg, J. Hardenbol, P. Van Veen, J. Thierry, and Z. Huang. 1995. A Triassic, Jurassic, and Cretaceous time scale. SEPM Special Publication 54 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 West Avalonia	Permian of China	Ammonite Chrons of Northwest Europe		Mesozoic Subages		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								Late Maastrichtian/Early Maastrichtian			66
		Campanian								Late Campanian/Middle Campanian/Early Campanian			72.1
		Santonian								Late Santonian/Middle Santonian/Early Santonian			83.6
		Coniacian								Late Coniacian/Middle Coniacian/Early Coniacian			86.3
		Turonian								Late Turonian/Middle Turonian/Early Turonian			89.8
		Cenomanian								Late Cenomanian/Middle Cenomanian/Early Cenomanian			93.9
	Early Cretaceous	Albian								Late Albian			100.5
										Middle Albian			106.2 *
										Early Albian			109.9 *
		Aptian								Late Aptian			113
		Aptian								Early Aptian			119.5 *
		Barremian								Late Barremian/Early Barremian			121.4
		Hauterivian								Late Hauterivian/Early Hauterivian			125.77
		Valanginian								Late Valanginian/Early Valanginian			132.6
		Berriasian								Late Berriasian			139.8
										Middle Berriasian			140.6 *
										Early Berriasian			142.7 *
Jurassic	Late Jurassic	Tithonian								Late Tithonian	Middle Tithonian		145
		Tithonian								Early Tithonian	Middle Tithonian		146.3 *
		Kimmeridgian								Late Kimmeridgian			149.2
		Kimmeridgian								Early Kimmeridgian			152.2 *
		Oxfordian								Late Oxfordian	Middle Oxfordian/Early Oxfordian		154.8
		Oxfordian									Middle Oxfordian/Early Oxfordian		157.9 *
	Middle Jurassic	Callovian								Late Callovian/Middle Callovian/Early Callovian			161.5
		Bathonian								Late Bathonian/Middle Bathonian/Early Bathonian			165.3
		Bajocian						Parkinsoni/Garantiana/Subfurcatum/Sauzei/Laeviuscula/Discites		Late Bajocian			168.2
									Humphresianum	Late Bajocian			168.4
									Humphresianum	Early Bajocian			168.6 *
		Aalenian						Concavum/Murchisonae/Opalinum		Late Aalenian/Middle Aalenian/Early Aalenian			170.9
	Early Jurassic	Toarcian						Levesquei/Variabilis/Bifrons	Thouarsense	Late Toarcian			174.7
										Late Toarcian			180.1
										Middle Toarcian			180.4 *
								Serpentinum/Falciferum/Tenuicostatum		Middle Toarcian			182
								Serpentinum/Falciferum/Tenuicostatum		Early Toarcian			182.9 *
		Pliensbachian						Spinatum/Margaritatus/Davoei/Ibex/Jamesoni		Late Pliensbachian/Early Pliensbachian			184.2
		Sinemurian						Raricostatum/Oxynotum/Obtusum/Turneri/Semicostatum/Bucklandi		Late Sinemurian/Early Sinemurian			192.9
		Hettangian						Angulata/Liasicus/Planorbis		Late Hettangian/Middle Hettangian/Early Hettangian			199.5
Triassic	Late Triassic	Rhaetian											201.4
		Norian								Sevatian			208.5
										Alaunian			213.2 *
										Lacian			216.7 *
		Carnian								Tuvalian			227
		Carnian								Julian			233.4 *
	Middle Triassic	Ladinian								Longobardian			237
		Ladinian								Fassanian			239.7 *
		Anisian								Illyrian			242
										Pelsonian			243.8 *
				Bithynian	244.7 *
				Aegean	245.5 *
	Early Triassic	Olenekian		Spathian	247.2
		Olenekian		Smithian	248.9 *
		Induan		Dienerian	251.2
		Induan		Griesbachian	251.4 *
Permian	Lopingian	Changhsingian		Meishanian		251.902
		Changhsingian		Baoqingian		253.4 *
		Wuchiapingian		Longtanian †		Laoshanian	254.14
		Wuchiapingian		Longtanian †		Laibinian	257.7 *
	Guadalupian	Capitanian				Lengwuan	259.51
		Wordian				Kuhfengian	264.28
		Roadian				Kuhfengian	266.9
	Cisuralian	Kungurian				Luodianian	273.01
		Artinskian				Luodianian	283.5
		Artinskian				Longlinian	285.4 *
		Sakmarian				Longlinian	290.1
		Asselian	Zisongian			293.52
Carboniferous	Pennsylvanian	Gzhelian	Zisongian			Mapingian †	298.9
		Gzhelian					300.1
		Kasimovian					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						419.2
	Ludlow	Ludfordian					423
	Ludlow	Gorstian					425.6
	Wenlock	Homerian					Gleedonian			427.4
		Homerian					Whitwellian			429.7 *
		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							Merioneth	Dolgellian/Trempealeauan	485.4
		Stage 10								Festiniogian	489.2 *
		Jiangshanian								Festiniogian	489.5
		Jiangshanian								Maentwrogian	493.1 *
		Paibian						494		Maentwrogian
	Miaolingian	Guzhangian						Series 3 †	St Davids		497
		Guzhangian									Arcadian	498.4
		Drumian										500.5
		Wuliuan		Stage 5 †								504.5
	Series 2	Stage 4							Branchian		Caerfai	509
		Stage 3							Branchian			514
		Stage 3							Placentian			517.1
	Terreneuvian	Stage 2										521
	Terreneuvian	Fortunian										529
													538.8