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

Show more time

Show linear time

International Chronostratigraphic Timescale			Obsolete Names for ICS Units			Ten Million Year Bins	Silurian of the Baltic	Devonian of France	Cambrian of West Avalonia	Permian of China	Cambrian of China
Quaternary	Holocene	Meghalayan				Cenozoic 6							0
		Northgrippian											0.0042
		Greenlandian											0.0082
	Pleistocene	Late Pleistocene											0.0117
		Chibanian											0.129
		Calabrian											0.774
		Gelasian											1.8
Neogene	Pliocene	Piacenzian	Tertiary †										2.58
	Pliocene	Zanclean											3.6
	Miocene	Messinian											5.333
		Tortonian											7.246
		Serravallian				Cenozoic 5							11.63
		Langhian											13.82
		Burdigalian											15.98
		Aquitanian											20.44
Paleogene	Oligocene	Chattian				Cenozoic 4							23.03
	Oligocene	Rupelian				Cenozoic 4							27.82
	Eocene	Priabonian				Cenozoic 3							33.9
		Bartonian				Cenozoic 3							37.71
		Lutetian				Cenozoic 2							41.2
		Ypresian				Cenozoic 2							47.8
	Paleocene	Thanetian				Cenozoic 1							56
		Selandian											59.2
		Danian											61.6
Cretaceous	Late Cretaceous	Maastrichtian				Cretaceous 8							66
		Campanian				Cretaceous 7							72.1
		Santonian				Cretaceous 6							83.6
		Coniacian											86.3
		Turonian											89.8
		Cenomanian				Cretaceous 5							93.9
	Early Cretaceous	Albian				Cretaceous 4							100.5
		Aptian				Cretaceous 3							113
		Barremian				Cretaceous 2							121.4
		Hauterivian				Cretaceous 2							125.77
		Valanginian				Cretaceous 1							132.6
		Berriasian				Cretaceous 1							139.8
Jurassic	Late Jurassic	Tithonian				Jurassic 6							145
		Kimmeridgian				Jurassic 5							149.2
		Oxfordian											154.8
	Middle Jurassic	Callovian											161.5
		Bathonian				Jurassic 4							165.3
		Bajocian				Jurassic 4							168.2
		Aalenian				Jurassic 3							170.9
	Early Jurassic	Toarcian				Jurassic 3							174.7
		Pliensbachian				Jurassic 2							184.2
		Sinemurian				Jurassic 1							192.9
		Hettangian				Jurassic 1							199.5
Triassic	Late Triassic	Rhaetian				Triassic 4							201.4
		Norian				Triassic 4							208.5
		Carnian				Triassic 3							227
	Middle Triassic	Ladinian				Triassic 2							237
	Middle Triassic	Anisian				Triassic 2							242
	Early Triassic	Olenekian				Triassic 1							247.2
	Early Triassic	Induan				Triassic 1							251.2
Permian	Lopingian	Changhsingian				Permian 4				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				Permian 3				Kuhfengian			266.9
	Cisuralian	Kungurian				Permian 2				Luodianian			273.01
		Artinskian								Luodianian			283.5
		Artinskian								Longlinian			285.4 *
		Sakmarian			290.1					Longlinian
		Asselian			Permian 1	Zisongian	293.52
Carboniferous	Pennsylvanian	Gzhelian			Carboniferous 5	Zisongian	298.9
		Gzhelian					300.1
		Kasimovian					303.7
		Moscovian			Carboniferous 4		307
		Bashkirian			Carboniferous 4		315.2
	Mississippian	Serpukhovian			Carboniferous 3		323.2
		Visean			Carboniferous 2		330.9
		Tournaisian			Carboniferous 1		346.7
Devonian	Late Devonian	Famennian			Devonian 5		Famennian	358.9
	Late Devonian	Frasnian			Devonian 4		Frasnian	372.2
	Middle Devonian	Givetian			Devonian 3		Givetian	382.7
	Middle Devonian	Eifelian			Devonian 3		Couvinien	387.7
	Early Devonian	Emsian			Devonian 2			393.3
		Pragian			Devonian 1			407.6
		Pragian					Coblencien	408.2 *
		Lochkovian					Gedinnine	410.8
Silurian	Pridoli				Silurian 2		Ohesaare		419.2
	Pridoli						Kaugetuma		421.7 *
	Ludlow	Ludfordian					Kuressaare		423
		Ludfordian					Paadla		423.4 *
		Gorstian					Paadla		425.6
	Wenlock	Homerian					Rootsikula		427.4
		Homerian	Jaagarahu				429.2 *
		Sheinwoodian	Jaagarahu				430.5
		Sheinwoodian	Jaani				431.8 *
	Llandovery	Telychian	Jaani		Silurian 1		433.4
		Telychian	Adavere				434 *
		Aeronian	Adavere				438.5
		Aeronian	Raikkula				439.4 *
		Rhuddanian	Raikkula				440.8
		Rhuddanian	Juuru				441.4 *
Ordovician	Late Ordovician	Hirnantian	Ordovician 5				443.8
		Katian	Ordovician 5				445.2
		Sandbian	Ordovician 4				453
	Middle Ordovician	Darriwilian	Ordovician 3				458.4
	Middle Ordovician	Dapingian	Ordovician 2				467.3
	Early Ordovician	Floian	Ordovician 2				470
	Early Ordovician	Tremadocian	Ordovician 1				477.7
Cambrian	Furongian	Stage 10	Cambrian 5				Niuchehean		Taoyuanian †	485.4
		Jiangshanian					Jiangshanian			489.5
		Paibian					Paibian			494
		Paibian					Paibian		Waergangian †/Youshuanian	494.9 *
	Miaolingian	Guzhangian	Series 3 †				Cambrian 4		Guzhangian	Wangcunian †	497
		Guzhangian							Guzhangian		Arcadian	498.4
		Drumian							Drumian			500.5
		Wuliuan		Stage 5 †			Cambrian 3		Wuliuan/Taijangian			504.5
	Series 2	Stage 4					Cambrian 3		Branchian		Duyunian	509
		Stage 3					Cambrian 2		Branchian		Nangaoian	514
		Stage 3							Placentian		Nangaoian	517.1
	Terreneuvian	Stage 2									Meishucunian	521
		Fortunian					Cambrian 1				Meishucunian	529
		Fortunian					Cambrian 1				Jinnigian	530.7
													538.8