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
B. D. Webby. 1998. Steps toward a global standard for Ordovician stratigraphy. Newsletters in Stratigraphy 36:1-33 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

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International Chronostratigraphic Timescale			Obsolete Names for ICS Units			Ordovician of the Baltic				Ammonite Chrons of North America			Ordovician of Britain
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
	Lopingian	Wuchiapingian		Longtanian †											254.14
	Guadalupian	Capitanian													259.51
		Wordian													264.28
		Roadian													266.9
	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		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	Harju		Porkuni	Ashgill	Hirnantian	443.8
		Katian			Pirgu		Rawtheyan	445.2
							Cautleyan	448.9 *
							Pusgillian	449.3 *
					Vormsi	Caradoc	Streffordian	Onnian †	449.6 *
					Nabala				Johvi †				450 *
			Viru		Rakvere								450.6 *
					Rakvere		Cheneyan						451.5 *
					Oandu		Cheneyan						452 *
					Oandu		Burrellian						452.7 *
		Sandbian			Keila				Idavere †				453
					Keila			Actonian †					453.2 *
					Haljala			Actonian †					453.9
								Marshbrookian †					Woolstonian †	454.2 *
								Longvillian †						455.2 *
					Kukruse									456.4 *
							Aurelucian							456.8 *
								Soudleyan †/Harnagian/Costonian						457.4 *
					Uhaku			Soudleyan †/Harnagian/Costonian	Aluoja †					457.5 *
	Middle Ordovician	Darriwilian			Uhaku	Llanvirn	Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn							458.4
					Lasnamagi									458.9 *
					Aseri									460.4 *
					Aseri		Abereiddian/Early Llanvirn							461.3 *
			Oeland		Kunda									462.9 *
					Kunda				Valaste †/Hunderum		464.3 *
					Volkhov						Langevoja †/Vaana/Saka			467.1 *
		Dapingian								467.3
						Arenig	Fennian			468.4 *
					Billingen					469.3 *
	Early Ordovician	Floian								470
									Latorp †		470.1 *
							Whitlandian				471.1 *
					Hunneberg		Whitlandian				473.7 *
							Moridunian				474.3 *
		Tremadocian				Tremadoc	Migneintian				477.7
				Cressagian			480.8 *
					Varangu		481.3 *
					Pakerort		482.2 *
							485 *
Cambrian	Furongian	Stage 10							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