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
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

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			Cambrian of China		Ordovician of Ibero-Bohemia				Silurian Ages of Europe	Ammonite Chrons of Northwest Europe		Permian of the Salt Range	Silurian of North America
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											Parkinsoni/Garantiana/Subfurcatum/Sauzei/Laeviuscula/Discites				168.2
		Bajocian												Humphresianum			168.4
		Aalenian											Concavum/Murchisonae/Opalinum				170.9
	Early Jurassic	Toarcian											Levesquei/Variabilis/Bifrons	Thouarsense			174.7
													Levesquei/Variabilis/Bifrons				180.1
													Serpentinum/Falciferum/Tenuicostatum				182
		Pliensbachian											Spinatum/Margaritatus/Davoei/Ibex/Jamesoni				184.2
		Sinemurian											Raricostatum/Oxynotum/Obtusum/Turneri/Semicostatum/Bucklandi				192.9
		Hettangian											Angulata/Liasicus/Planorbis				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
		Induan															251.2
		Induan													Kathwai		251.5 *
Permian	Lopingian	Changhsingian													Kathwai		251.902
																	252.4 *
															Chhidru		252.9 *
		Wuchiapingian		Longtanian †											Chhidru		254.14
															Kalabagh		255 *
															Wargal		256 *
	Guadalupian	Capitanian															259.51
		Wordian															264.28
																	265.3 *
															Amb		266.1 *
		Roadian													Amb		266.9
		Roadian															270.7 *
	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			Gleedonian	Lockportian	427.4
		Homerian			Whitwellian	Lockportian	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	Kosovian						443.8
		Katian	Kralodvorian						Bohdalec †	445.2
		Katian	Berounian							449.7 *
		Sandbian								453
										Zahorany †/Vinice	Letna †	456.2 *
									Liben †			458 *
	Middle Ordovician	Darriwilian										458.4
			Dobrotivian									458.5 *
			Oretanian									459.7 *
									Sarka †			461.7 *
		Dapingian							Klabava †			467.3
		Dapingian	Arenigian									468
	Early Ordovician	Floian	Arenigian									470
	Early Ordovician	Tremadocian	Tremadocian									477.7
Cambrian	Furongian	Stage 10	Niuchehean									Taoyuanian †		485.4
		Jiangshanian	Jiangshanian											489.5
		Paibian	Paibian											494
		Paibian	Paibian									Waergangian †/Youshuanian		494.9 *
	Miaolingian	Guzhangian	Series 3 †									Guzhangian		Wangcunian †		497
		Drumian										Drumian		Wangcunian †		500.5
		Wuliuan		Stage 5 †								Wuliuan/Taijangian				504.5
	Series 2	Stage 4										Duyunian				509
	Series 2	Stage 3										Nangaoian				514
	Terreneuvian	Stage 2										Meishucunian				521
		Fortunian										Meishucunian				529
		Fortunian										Jinnigian				530.7
																	538.8