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 China			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	Hirnantian		Xiaoxita †/Shikou	Wufeng †	Harju	Porkuni	Ashgill	Hirnantian	443.8
		Katian	Chientangkiangian					Pirgu		Rawtheyan	445.2
										Cautleyan	448.9 *
										Pusgillian	449.3 *
			Neichianshanian/Hanjiang							Pusgillian	449.5
								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	Darriwilian		Guniu †/Hulo			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 *
												Valaste †/Hunderum		464.3 *
					Hunjiang †	Dawan †/Daobaowan/Ningkuo							466.3 *
								Volkhov					Langevoja †/Vaana/Saka	467.1 *
		Dapingian	Dapingian											467.3
									Arenig	Fennian				468.4 *
								Billingen						469.3 *
	Early Ordovician	Floian	Yiyangian											470
												Latorp †		470.1 *
										Whitlandian				471.1 *
								Hunneberg		Whitlandian				473.7 *
				Moridunian						474.3 *
		Tremadocian	Xinchangian	Tremadoc					Migneintian	477.7
						Lianghekou †			Migneintian	477.9 *
									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