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
F. M. Gradstein, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 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				Devonian of Germany	Devonian Subages	Silurian of England		Ammonite Chrons 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												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			Mapingian †	298.9
		Kasimovian			Mapingian †	303.7
		Kasimovian				305.9
		Moscovian				307
		Bashkirian				315.2
	Mississippian	Serpukhovian				323.2
		Visean				330.9
		Tournaisian				346.7
Devonian	Late Devonian	Famennian				Wocklum/Dasberg/Hemberg/Nehden	Late Famennian	Famennian	358.9
							Middle Famennian		365.3 *
							Early Famennian		368.5 *
		Frasnian				Adorf	Late Frasnian	Frasnian	372.2
							Middle Frasnian		375.4 *
			Early Frasnian				379.3 *
	Middle Devonian	Givetian	Givetian			Late Givetian	Givetian	382.7
						Middle Givetian		383.7 *
						Early Givetian		385.9 *
		Eifelian	Eifelian			Late Eifelian	Couvinien	387.7
		Eifelian	Eifelian			Early Eifelian		390.3 *
	Early Devonian	Emsian	Emsian			Late Emsian		393.3
		Emsian	Emsian			Early Emsian		398.3 *
		Pragian	Siegen			Pragian		407.6
		Pragian	Siegen			Pragian	Coblencien	408.2 *
		Lochkovian	Gedinnine			Late Lochkovian	Gedinnine	410.8
						Middle Lochkovian		412.8 *
						Early Lochkovian		415.6 *
Silurian	Pridoli							Red Downtonian/Temeside Shales/Downton Castle	Whitcliffe/Leintwardine	419.2
	Pridoli							Red Downtonian/Temeside Shales/Downton Castle	Bringewood/Elton	421.3
	Ludlow	Ludfordian						Coalbrookdale	Wenlock (England)/Tickwood	423
		Gorstian								425.6
		Gorstian							Buildwas	426.4 *
	Wenlock	Homerian							Buildwas	Gleedonian	427.4
								Wych	Woolhope	Gleedonian	428.4 *
										Whitwellian	429.7 *
		Sheinwoodian									430.5
	Llandovery	Telychian									433.4
		Telychian									436.3 *
		Aeronian									438.5
		Aeronian						Cowleigh Park			439.3 *
		Rhuddanian						Cowleigh Park			440.8
Ordovician	Late Ordovician	Hirnantian						Harju			Porkuni	443.8
		Katian									Pirgu	445.2
											Vormsi	449.6 *
											Nabala	Johvi †	450 *
								Viru			Rakvere		450.6 *
											Oandu		452 *
		Sandbian									Keila	Idavere †	453
											Haljala		453.9
											Kukruse		456.4 *
											Uhaku	Aluoja †	457.5 *
	Middle Ordovician	Darriwilian									Uhaku		458.4
											Lasnamagi		458.9 *
											Aseri		460.4 *
								Oeland			Kunda		462.9 *
											Kunda	Valaste †/Hunderum	464.3 *
											Volkhov		Langevoja †/Vaana/Saka	467.1 *
		Dapingian									Volkhov			467.3
		Dapingian		Billingen							469.3 *
	Early Ordovician	Floian									470
											Latorp †		470.1 *
				Hunneberg									473.7 *
		Tremadocian		Hunneberg									477.7
				Varangu									481.3 *
				Pakerort									482.2 *
Cambrian	Furongian	Stage 10		Pakerort									Merioneth	Dolgellian/Trempealeauan	485.4
															486.3 *
								486.5
								Festiniogian						489.2 *
		Jiangshanian						Festiniogian						489.5
		Jiangshanian						Maentwrogian						493.1 *
		Paibian						Maentwrogian						494
	Miaolingian	Guzhangian						Series 3 †					St Davids		497
		Drumian													500.5
		Wuliuan													Stage 5 †	504.5
	Series 2	Stage 4													Caerfai	509
	Series 2	Stage 3														514
	Terreneuvian	Stage 2														521
	Terreneuvian	Fortunian														529
																	538.8