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

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 North America			Permian of Western Europe	Permian of the Pamirs	Devonian of Eastern North America		Carboniferous of China	Devonian of Germany	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														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								Dorashamian						251.902
	Lopingian	Wuchiapingian		Longtanian †					Zechstein	Dzhulfian						254.14
	Guadalupian	Capitanian							Rotliegendes	Midian						259.51
		Wordian								Midian						264.28
		Wordian								Murgabian						266.2 *
		Roadian								Murgabian						266.9
	Cisuralian	Kungurian								Kubergandian						273.01
		Kungurian								Bolorian						279.8
		Artinskian							Autunian	Bolorian						283.5
		Artinskian								Yakhtashian						286
		Sakmarian								Sakmarian						290.1
		Asselian								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			Conewangan/Conneautan/Canadaway		Wocklum/Dasberg/Hemberg/Nehden	358.9
	Late Devonian	Frasnian			West Fallsian/Sonyean		Adorf	372.2
	Middle Devonian	Givetian			Geneseean/Taghanican/Tioughniogan		Cazenovian	Givetian			382.7
	Middle Devonian	Eifelian			Southwoodian		Cazenovian	Eifelian			387.7
	Early Devonian	Emsian			Sawkillian/Deer Parkian		Helderbergian	Emsian			393.3
		Pragian						Siegen			407.6
		Lochkovian						Gedinnine			410.8
Silurian	Pridoli						Cayugan					419.2
	Pridoli						Niagaran					422.5 *
	Ludlow	Ludfordian	423
	Ludlow	Gorstian	425.6
	Wenlock	Homerian	Lockportian									427.4
	Wenlock	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											443.8
		Katian											445.2
		Sandbian											453
	Middle Ordovician	Darriwilian											458.4
	Middle Ordovician	Dapingian											467.3
	Early Ordovician	Floian											470
	Early Ordovician	Tremadocian											477.7
Cambrian	Furongian	Stage 10											Late Cambrian	485.4
		Jiangshanian												489.5
		Paibian												494
	Miaolingian	Guzhangian											Series 3 †	Middle Cambrian	497
		Drumian													500.5
		Wuliuan		Stage 5 †											504.5
	Series 2	Stage 4												Early Cambrian	509
	Series 2	Stage 3													514
	Terreneuvian	Stage 2													521
	Terreneuvian	Fortunian													529
																538.8