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
B. D. Webby. 1998. Steps toward a global standard for Ordovician stratigraphy. Newsletters in Stratigraphy 36:1-33 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			Permian of North America		Silurian of England	Ordovician of Ibero-Bohemia				Devonian of Czechoslovakia	Cenozoic Subepochs	Silurian of North America			Ordovician of the Baltic
Quaternary	Pleistocene	Late Pleistocene												Late Pleistocene						0.0117
		Chibanian												Middle Pleistocene						0.129
		Calabrian												Early Pleistocene						0.774
		Gelasian												Early Pleistocene						1.8
Neogene	Pliocene	Piacenzian	Tertiary †											Late Pliocene						2.58
	Pliocene	Zanclean												Early Pliocene						3.6
	Miocene	Messinian												Late Miocene						5.333
		Tortonian												Late Miocene						7.246
		Serravallian												Middle Miocene						11.63
		Langhian												Middle Miocene						13.82
		Burdigalian												Early Miocene						15.98
		Aquitanian												Early Miocene						20.44
Paleogene	Oligocene	Chattian												Late Oligocene						23.03
	Oligocene	Rupelian												Early Oligocene						27.82
	Eocene	Priabonian												Late Eocene						33.9
		Bartonian												Middle Eocene						37.71
		Lutetian												Middle Eocene						41.2
		Ypresian												Early Eocene						47.8
	Paleocene	Thanetian												Late Paleocene						56
		Selandian												Middle Paleocene						59.2
		Danian												Early Paleocene						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 †																254.14
	Guadalupian	Capitanian				Capitanian														259.51
		Wordian				Wordian														264.28
		Roadian				Roadian														266.9
	Cisuralian	Kungurian				Leonardian	Cathedralian													273.01
		Kungurian					Hessian													281.9 *
		Artinskian					Hessian													283.5
		Artinskian				Wolfcampian	Lenoxian													286.1 *
		Sakmarian					Lenoxian													290.1
		Asselian					Nealian													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			Srbsko			382.7
	Middle Devonian	Eifelian			Chotec			387.7
	Early Devonian	Emsian			Daleje/Zlichovian			393.3
		Pragian			Pragian			407.6
		Lochkovian			Lochkovian			410.8
Silurian	Pridoli				Red Downtonian/Temeside Shales/Downton Castle			Whitcliffe/Leintwardine	Cayugan	419.2
								Bringewood/Elton	Cayugan	421.3
								Bringewood/Elton	Niagaran	422.5 *
	Ludlow	Ludfordian			Coalbrookdale			Wenlock (England)/Tickwood		423
		Gorstian								425.6
		Gorstian						Buildwas		426.4 *
	Wenlock	Homerian						Buildwas		Lockportian	427.4
		Homerian			Wych			Woolhope		Lockportian	428.4 *
		Sheinwoodian									430.5
	Llandovery	Telychian	Ontarian							433.4
		Telychian								436.3 *
		Aeronian								438.5
										Alexandrian	438.7 *
					Cowleigh Park						439.3 *
			Medinan						Clinton		440.1 *
											440.7 *
		Rhuddanian									440.8
Ordovician	Late Ordovician	Hirnantian			Kosovian							Harju	Porkuni	443.8
		Katian			Kralodvorian								Bohdalec †	Pirgu	445.2
					Kralodvorian									Vormsi	449.6 *
					Berounian									Vormsi	449.7 *
														Nabala	Johvi †	450 *
												Viru		Rakvere		450.6 *
														Oandu		452 *
		Sandbian												Keila	Idavere †	453
														Haljala		453.9
														Haljala		Zahorany †/Vinice	Letna †	456.2 *
														Kukruse				456.4 *
														Uhaku	Aluoja †			457.5 *
													Liben †					458 *
	Middle Ordovician	Darriwilian																458.4
					Dobrotivian													458.5 *
					Dobrotivian									Lasnamagi				458.9 *
					Oretanian									Lasnamagi				459.7 *
														Aseri				460.4 *
													Sarka †	Aseri				461.7 *
												Oeland		Kunda				462.9 *
														Kunda	Valaste †/Hunderum			464.3 *
														Volkhov				Langevoja †/Vaana/Saka	467.1 *
		Dapingian											Klabava †						467.3
					Arenigian														468
				Billingen										469.3 *
	Early Ordovician	Floian												470
														Latorp †				470.1 *
				Hunneberg														473.7 *
		Tremadocian		Hunneberg	Tremadocian													477.7
				Varangu														481.3 *
				Pakerort														482.2 *
Cambrian	Furongian	Stage 10		Pakerort														485.4
																		486.3 *
							486.5
		Jiangshanian					489.5
		Paibian					494
	Miaolingian	Guzhangian					Series 3 †					497
		Drumian										500.5
		Wuliuan										Stage 5 †						504.5
																				509