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
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, 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

Show more time

Show linear time

International Chronostratigraphic Timescale			Obsolete Names for ICS Units			Ammonite Chrons of North America			Permian of Western Europe	Permian of the Russian Platform		Carboniferous of Western Europe
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				Epizigzagiceras								168.2
		Bajocian				Rotundum/Oblatum/Kirschneri/Crassicostatus/Widebayense								168.4
		Aalenian				Howelli/Scissum/Westermanni								170.9
	Early Jurassic	Toarcian				Yakounensis/Hillebrandti/Crassicosta								174.7
						Planulata								179.3 *
						Planulata		Arnioceras arnouldi						179.8 *
						Kanense								181.3 *
						Carlottense								182.3 *
						Kunae								183.5 *
		Pliensbachian				Kunae								184.2
						Freboldi								185.1 *
						Whiteavesi/Imlayi	Tetraspidoceras							186.2 *
							Tetraspidoceras							189.2 *
						Plesechioceras harbledownense/Asteroceras varians/Coroniceras	Canadensis							190.3 *
		Sinemurian												192.9
						Pseudaetomoceras		Psiloceras						196.4 *
						Franziceras/Euphyllites								196.5 *
		Hettangian				Franziceras/Euphyllites								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
		Wuchiapingian		Longtanian †					Zechstein					254.14
		Wuchiapingian		Longtanian †					Zechstein	Tatarian	Vyatkian			256.8 *
	Guadalupian	Capitanian							Rotliegendes		Severodvinian			259.51
		Wordian									Urzhumian			264.28
		Roadian			Kazanian					Povolzhian	266.9
		Roadian			Kazanian					Sokian	270.7 *
	Cisuralian	Kungurian			Kungurian					Irenian/Ufimian	273.01
										Filipovian	276.5 *
										Saraninian	280.1 *
		Artinskian			Autunian				Artinskian	Sarginian	283.5
										Irginian	285.9 *
										Burtsevian	287.8 *
		Sakmarian							Sakmarian	Sterlitamakian	290.1
		Sakmarian							Sakmarian	Tastubian	291.7 *
		Asselian							Asselian	Shikhanian	293.52
										Uskalykian	294.8
										Surenian	297.5
										Surenian	Kuzel	297.7
Carboniferous	Pennsylvanian	Gzhelian									Kuzel	298.9
											Stephanian	Stephanian C	300.3 *
												Stephanian B	300.9 *
			Stephanian A									301.4 *
		Kasimovian	Stephanian A									303.7
		Kasimovian	Cantabrian									305 *
		Moscovian	Cantabrian									307
			Westphalian								Westphalian D	307.4 *
											Westphalian C	309.8
											Westphalian B	314.6
		Bashkirian									Westphalian B	315.2
											Westphalian A	317 *
			Namurian								Yeadonian	318.8 *
											Marsdenian	320.2 *
											Kinderscoutian	321.5 *
											Alportian	322 *
											Chokierian	323.1 *
	Mississippian	Serpukhovian									Chokierian	323.2
											Arnsbergian	324 *
											Pendleian	327.4 *
		Visean	Warnantian								Brigantian †	330.9
			Livian								Asbian †	336.3 *
			Moliniacian								Holkerian †/Arundian/Chadian	340.2 *
		Tournaisian	Ivorian									346.7
		Tournaisian	Hastarian									353.7 *
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										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				485.4
		Jiangshanian		489.5
		Paibian		494
	Miaolingian	Guzhangian		Series 3 †		497
		Drumian				500.5
		Wuliuan				Stage 5 †	504.5
														509