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
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
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			Cambrian of Kazakhstan	Permian of the Salt Range	Devonian Subages	Ammonite Chrons of North America			Cambrian Epochs
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
		Induan											251.2
		Induan					Kathwai						251.5 *
Permian	Lopingian	Changhsingian					Kathwai						251.902
													252.4 *
							Chhidru						252.9 *
		Wuchiapingian		Longtanian †			Chhidru						254.14
					Kalabagh	255 *
					Wargal	256 *
	Guadalupian	Capitanian				259.51
		Wordian				264.28
						265.3 *
					Amb	266.1 *
		Roadian			Amb	266.9
		Roadian				270.7 *
	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	Late Famennian			358.9
			Middle Famennian			365.3 *
			Early Famennian			368.5 *
		Frasnian	Late Frasnian			372.2
			Middle Frasnian			375.4 *
			Early Frasnian			379.3 *
	Middle Devonian	Givetian	Late Givetian			382.7
			Middle Givetian			383.7 *
			Early Givetian			385.9 *
		Eifelian	Late Eifelian			387.7
		Eifelian	Early Eifelian			390.3 *
	Early Devonian	Emsian	Late Emsian			393.3
		Emsian	Early Emsian			398.3 *
		Pragian	Pragian			407.6
		Lochkovian	Late Lochkovian			410.8
			Middle Lochkovian			412.8 *
			Early Lochkovian			415.6 *
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				Ashgill	Hirnantian	443.8
		Katian					Rawtheyan	445.2
							Cautleyan	448.9 *
							Pusgillian	449.3 *
						Caradoc	Streffordian	Onnian †				449.6 *
							Cheneyan					451.5 *
							Burrellian			452.7 *
		Sandbian								453
								Actonian †	453.2 *
								Marshbrookian †	Woolstonian †	454.2 *
								Longvillian †		455.2 *
							Aurelucian	Longvillian †		456.8 *
							Aurelucian	Soudleyan †/Harnagian/Costonian		457.4 *
	Middle Ordovician	Darriwilian				Llanvirn	Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn			458.4
		Darriwilian					Abereiddian/Early Llanvirn			461.3 *
		Dapingian					Abereiddian/Early Llanvirn			467.3
		Dapingian				Arenig	Fennian			468.4 *
	Early Ordovician	Floian					Fennian			470
							Whitlandian			471.1 *
							Moridunian			474.3 *
		Tremadocian				Ungurian	Tremadoc			Migneintian	477.7
							Tremadoc			Cressagian	480.8 *
										485 *
Cambrian	Furongian	Stage 10				Batyrbaian				Late Cambrian	485.4
		Jiangshanian				Batyrbaian					489.5
						Aksaian					490.7 *
						Sakian					492.2 *
		Paibian			494	Sakian
	Miaolingian	Guzhangian			Series 3 †	Ayusokkanian				Middle Cambrian	497
		Guzhangian									499.5
		Drumian				Zhanaarykian					500.5
		Drumian				Tuesaian					503
		Wuliuan				Tuesaian					Stage 5 †	504.5
		Wuliuan									Stage 5 †	505.3
	Series 2	Stage 4									Early Cambrian	509
						Toyonian						510 *
						Botomian						512.5 *
		Stage 3				Botomian						514
		Stage 3				Atdabanian						515.6 *
	Terreneuvian	Stage 2				Tommotian						521
		Stage 2										525.5
		Fortunian										529
													538.8