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
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
A. D. Barnosky, M. Holmes, R. Kirchholtes, E. Lindsey, K.C. Maguire, A.W. Poust, M.A. Stegner, J. Sunseri, B. Swartz, J. Swift, N.A. Villavicencio and G. Wogan. 2014. Prelude to the Anthropocene: Two new North American Land Mammal Ages (NALMAs). The Anthropocene Review I(3):225-242 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 Australia	Cambrian Epochs	Ordovician of the Baltic			Silurian of North America			Carboniferous of China	North American Land Mammal Ages	Ordovician of Ibero-Bohemia
Quaternary	Holocene	Meghalayan													Saintaugustinean					0
		Meghalayan													Santarosean					0.0004
		Northgrippian																		0.0042
		Greenlandian																		0.0082
	Pleistocene	Late Pleistocene																		0.0117
		Late Pleistocene													Rancholabrean					0.014
		Chibanian													Rancholabrean					0.129
		Chibanian													Irvingtonian					0.21
		Calabrian													Irvingtonian					0.774
		Calabrian													Blancan					1.4
		Gelasian																		1.8
Neogene	Pliocene	Piacenzian	Tertiary †																	2.58
		Zanclean																		3.6
		Zanclean													Hemphillian					4.7
	Miocene	Messinian																		5.333
		Tortonian																		7.246
		Tortonian													Clarendonian					9.4
		Serravallian													Clarendonian					11.63
		Serravallian													Barstovian					12.5
		Langhian																		13.82
		Burdigalian																		15.98
															Hemingfordian					16.3
															Arikareean					18.5
		Aquitanian																		20.44
Paleogene	Oligocene	Chattian																		23.03
		Rupelian																		27.82
															Whitneyan					29.5
															Orellan					31.8
	Eocene	Priabonian													Chadronian					33.9
		Priabonian													Duchesnean					37
		Bartonian													Duchesnean					37.71
		Bartonian													Uintan					39.7
		Lutetian													Uintan					41.2
		Lutetian													Bridgerian					46.2
		Ypresian													Bridgerian					47.8
															Wasatchian					50.5
															Clarkforkian					54.9
	Paleocene	Thanetian													Clarkforkian					56
		Thanetian													Tiffanian					56.2
		Selandian													Tiffanian					59.2
		Selandian													Torrejonian					60.9
		Danian													Torrejonian					61.6
		Danian													Puercan					63.8
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																		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			293.52
Carboniferous	Pennsylvanian	Gzhelian			298.9
		Gzhelian			Xiaodushanian	300 *
		Kasimovian			Xiaodushanian	303.7
		Kasimovian			Dalaun	305.8 *
		Moscovian				307
		Bashkirian				315.2
					Huashibanian	318.5 *
					Lousuan	321.2 *
	Mississippian	Serpukhovian			Dewunian	323.2
		Serpukhovian			Shangsian	330.8 *
		Visean			Shangsian	330.9
		Visean			Jiusian	335 *
		Tournaisian			Tangbagouan	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					Cayugan	419.2
	Pridoli					Niagaran	422.5 *
	Ludlow	Ludfordian					423
	Ludlow	Gorstian					425.6
	Wenlock	Homerian					Lockportian	Gleedonian	427.4
		Homerian	Whitwellian				Lockportian	429.7 *
		Sheinwoodian						430.5
	Llandovery	Telychian	Ontarian					433.4
		Aeronian						438.5
								Alexandrian	438.7 *
			Medinan			Clinton			440.1 *
									440.7 *
		Rhuddanian							440.8
Ordovician	Late Ordovician	Hirnantian	Harju					Porkuni		Kosovian	443.8
		Katian						Pirgu		Kralodvorian	Bohdalec †	445.2
								Vormsi		Kralodvorian		449.6 *
								Vormsi		Berounian		449.7 *
								Nabala				Johvi †	450 *
			Viru					Rakvere					450.6 *
								Oandu					452 *
		Sandbian						Keila				Idavere †	453
								Haljala					453.9
								Haljala					Zahorany †/Vinice	Letna †	456.2 *
								Kukruse							456.4 *
								Uhaku				Aluoja †			457.5 *
											Liben †				458 *
	Middle Ordovician	Darriwilian													458.4
										Dobrotivian					458.5 *
								Lasnamagi		Dobrotivian					458.9 *
								Lasnamagi		Oretanian					459.7 *
								Aseri							460.4 *
								Aseri			Sarka †				461.7 *
			Oeland					Kunda							462.9 *
								Kunda				Valaste †/Hunderum			464.3 *
								Volkhov							Langevoja †/Vaana/Saka	467.1 *
		Dapingian									Klabava †					467.3
										Arenigian						468
				Billingen				469.3 *
	Early Ordovician	Floian						470
								Latorp †							470.1 *
				Hunneberg											473.7 *
		Tremadocian		Hunneberg						Tremadocian					477.7
				Varangu											481.3 *
				Pakerort											482.2 *
Cambrian	Furongian	Stage 10		Pakerort				Datsonian		Late Cambrian							485.4
																	486.3 *
																	486.5
								Payntonian									486.8 *
		Jiangshanian						Iverian									489.5
		Paibian						Idamean									494
	Miaolingian	Guzhangian						Series 3 †		Mindyallan							Middle Cambrian	497
		Guzhangian								Boomerangian								499
		Drumian								Undillan								500.5
		Drumian								Floran								503
		Wuliuan								Stage 5 †								Templetonian	504.5
		Wuliuan								Stage 5 †								Ordian	507.8 *
	Series 2	Stage 4															Early Cambrian	Ordian	509
		Stage 4																510.8 *
		Stage 3																514
	Terreneuvian	Stage 2																521
	Terreneuvian	Fortunian																529
																				538.8