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
F. M. Gradstein, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 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			Ordovician of the Baltic						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											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