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
D. H. Erwin and S. A. Bowring. 2004. Cambrian time scale. 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			Silurian of the Baltic	Ordovician of Britain				Devonian of Germany	Cambrian Epochs	Permian of the Salt Range	Cambrian of Britain		Cambrian of Siberia			Cretaceous Subepochs	Carboniferous Subepochs
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
		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			Late Pennsylvanian	298.9
		Kasimovian			Late Pennsylvanian	303.7
		Moscovian			Middle Pennsylvanian	307
		Bashkirian			Early Pennsylvanian	315.2
	Mississippian	Serpukhovian			Late Mississippian	323.2
		Visean			Middle Mississippian	330.9
		Tournaisian			Early Mississippian	346.7
Devonian	Late Devonian	Famennian			Wocklum/Dasberg/Hemberg/Nehden		358.9
	Late Devonian	Frasnian			Adorf		372.2
	Middle Devonian	Givetian			Givetian		382.7
	Middle Devonian	Eifelian			Eifelian		387.7
	Early Devonian	Emsian			Emsian		393.3
		Pragian			Siegen		407.6
		Lochkovian			Gedinnine		410.8
Silurian	Pridoli				Ohesaare			419.2
	Pridoli				Kaugetuma			421.7 *
	Ludlow	Ludfordian			Kuressaare			423
		Ludfordian	Paadla		423.4 *
		Gorstian	Paadla		425.6
	Wenlock	Homerian	Rootsikula		427.4
		Homerian	Jaagarahu		429.2 *
		Sheinwoodian	Jaagarahu		430.5
		Sheinwoodian	Jaani		431.8 *
	Llandovery	Telychian	Jaani		433.4
		Telychian	Adavere		434 *
		Aeronian	Adavere		438.5
		Aeronian	Raikkula		439.4 *
		Rhuddanian	Raikkula		440.8
		Rhuddanian	Juuru		441.4 *
Ordovician	Late Ordovician	Hirnantian			Ashgill			Hirnantian	Harju	Porkuni	443.8
		Katian						Rawtheyan		Pirgu	445.2
								Cautleyan			448.9 *
								Pusgillian			449.3 *
					Caradoc			Streffordian		Onnian †	Vormsi	449.6 *
											Nabala	Johvi †		450 *
									Viru		Rakvere			450.6 *
								Cheneyan			Rakvere			451.5 *
								Cheneyan			Oandu			452 *
								Burrellian			Oandu			452.7 *
		Sandbian									Keila	Idavere †		453
										Actonian †	Keila			453.2 *
										Actonian †	Haljala			453.9
										Marshbrookian †				Woolstonian †	454.2 *
										Longvillian †					455.2 *
											Kukruse				456.4 *
								Aurelucian							456.8 *
										Soudleyan †/Harnagian/Costonian					457.4 *
										Soudleyan †/Harnagian/Costonian	Uhaku	Aluoja †			457.5 *
	Middle Ordovician	Darriwilian			Llanvirn			Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn			Uhaku				458.4
											Lasnamagi				458.9 *
											Aseri				460.4 *
								Abereiddian/Early Llanvirn			Aseri				461.3 *
									Oeland		Kunda				462.9 *
											Kunda	Valaste †/Hunderum			464.3 *
				Volkhov							Langevoja †/Vaana/Saka				467.1 *
		Dapingian													467.3
					Arenig			Fennian							468.4 *
				Billingen											469.3 *
	Early Ordovician	Floian													470
											Latorp †		470.1 *
								Whitlandian					471.1 *
				Hunneberg				Whitlandian					473.7 *
								Moridunian					474.3 *
		Tremadocian			Tremadoc			Migneintian					477.7
								Cressagian					480.8 *
				Varangu									481.3 *
				Pakerort									482.2 *
													Mansian †		483.55 *
													Mansian †		485 *
Cambrian	Furongian	Stage 10									Late Cambrian		Merioneth		Dolgellian/Trempealeauan	Batyrbaian	Tavgian †	Ketyan †/Yurakian		485.4
																				486.3 *
									486.5
									Festiniogian						489.2 *
		Jiangshanian													489.5
															Aksaian	490.7 *
															Sakian	492.2 *
									Maentwrogian							493.1 *
		Paibian														494
		Paibian					Ensyan †/Maduan/Nganasanian									494.7 *
	Miaolingian	Guzhangian					Series 3 †		Middle Cambrian		St Davids				Ayusokkanian			497
		Guzhangian													Mayan/Menevian			499.5
		Drumian													Mayan/Menevian			500.5
		Wuliuan													Stage 5 †			Amgan/Solvan		504.5
	Series 2	Stage 4									Early Cambrian				Caerfai			Amgan/Solvan		509
																Toyonian		Lenian †		510 *
																Botomian				512.5 *
		Stage 3														Botomian				514
		Stage 3														Atdabanian				515.6 *
	Terreneuvian	Stage 2														Tommotian				521
		Stage 2														Nemakit-Daldynian				525.5
		Fortunian														Nemakit-Daldynian		Manykaian †		529
																					538.8