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, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 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

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			Cretaceous Subepochs	Carboniferous of North America	Devonian Subages	Cambrian Epochs	Ordovician of Britain				Obsolete Carboniferous Ages of China	Ordovician of China			Devonian of Eastern 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				Senonian														66
		Campanian																		72.1
		Santonian																		83.6
		Coniacian																		86.3
		Turonian																		89.8
		Cenomanian																		93.9
	Early Cretaceous	Albian				Gallic														100.5
		Aptian																		113
		Barremian																		121.4
		Hauterivian				Neocomian														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																		259.51
		Wordian																		264.28
		Roadian																		266.9
	Cisuralian	Kungurian																		273.01
		Artinskian																		283.5
		Sakmarian																		290.1
		Asselian					Bursumian †													293.52
Carboniferous	Pennsylvanian	Gzhelian					Virgilian							Mapingian †						298.9
		Kasimovian					Missourian							Mapingian †						303.7
		Kasimovian					Desmoinesian													305.9 *
		Moscovian					Desmoinesian													307
		Moscovian					Atokan													312.7 *
		Bashkirian					Atokan													315.2
		Bashkirian					Morrowan													318.4 *
	Mississippian	Serpukhovian					Chesterian													323.2
		Visean			330.9		Chesterian
					Meramecian		335.8 *
					Osagean		343.1 *
		Tournaisian			Osagean		346.7
		Tournaisian			Kinderhookian		351.9 *
Devonian	Late Devonian	Famennian					Late Famennian	Conewangan/Conneautan/Canadaway	358.9
							Middle Famennian		365.3 *
							Early Famennian		368.5 *
		Frasnian					Late Frasnian	West Fallsian/Sonyean	372.2
							Middle Frasnian		375.4 *
							Early Frasnian		379.3 *
	Middle Devonian	Givetian					Late Givetian	Geneseean/Taghanican/Tioughniogan	Cazenovian	382.7
							Middle Givetian			383.7 *
							Early Givetian			385.9 *
		Eifelian					Late Eifelian	Southwoodian		387.7
		Eifelian					Early Eifelian	Southwoodian		390.3 *
	Early Devonian	Emsian					Late Emsian	Sawkillian/Deer Parkian	Helderbergian	393.3
		Emsian	Early Emsian				398.3 *	Sawkillian/Deer Parkian
		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	Hirnantian	Xiaoxita †/Shikou	Wufeng †	443.8
		Katian							Rawtheyan	Chientangkiangian			445.2
									Cautleyan				448.9 *
									Pusgillian				449.3 *
									Pusgillian	Neichianshanian/Hanjiang			449.5
						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		Darriwilian		Guniu †/Hulo			458.4
									Abereiddian/Early Llanvirn				Guniu †/Hulo			461.3 *
												Hunjiang †	Dawan †/Daobaowan/Ningkuo			466.3 *
		Dapingian									Dapingian					467.3
		Dapingian				Arenig			Fennian		Dapingian					468.4 *
	Early Ordovician	Floian		Yiyangian					Fennian		470
									Whitlandian		471.1 *
									Moridunian		474.3 *
		Tremadocian		Tremadoc		Migneintian			Xinchangian		477.7
						Migneintian					Lianghekou †		477.9 *
						Cressagian							480.8 *
													485 *
Cambrian	Furongian	Stage 10							Late Cambrian							Franconian †/Dresbachian/Millardan	485.4
		Stage 10															Sunwaptan	487.5
		Jiangshanian												489.5			Sunwaptan
		Jiangshanian												Steptoean			493 *
		Paibian												Steptoean			494
	Miaolingian	Guzhangian							Series 3 †					Middle Cambrian		Marjumian	Albertian †	497
		Drumian														Marjumian		500.5
		Wuliuan														Stage 5 †		Topazan	504.5
		Wuliuan														Stage 5 †		Delamaran	506.5
	Series 2	Stage 4														Early Cambrian	Waucoban †	Delamaran	509
		Stage 4																Dyeran	511 *
		Stage 3																Dyeran	514
																		Montezuman	514.8 *
					Begadean													519.9 *
	Terreneuvian	Stage 2																521
	Terreneuvian	Fortunian																529
																				538.8