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
J. Palfy, P. L. Smith, and J. K. Mortensen. 2000. A U-Pb and 40Ar/39Ar time scale for the Jurassic. Canadian Journal of Earth Sciences 37(6):923-944 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			Ten Million Year Bins	Cretaceous Subepochs	Cambrian of North America		Permian of the Salt Range	Ammonite Chrons of North America			Cenozoic Subepochs	Silurian of North America
Quaternary	Holocene	Meghalayan				Cenozoic 6										0
		Northgrippian														0.0042
		Greenlandian														0.0082
	Pleistocene	Late Pleistocene												Late Pleistocene		0.0117
		Chibanian												Middle Pleistocene		0.129
		Calabrian												Early Pleistocene		0.774
		Gelasian												Early Pleistocene		1.8
Neogene	Pliocene	Piacenzian	Tertiary †											Late Pliocene		2.58
	Pliocene	Zanclean												Early Pliocene		3.6
	Miocene	Messinian												Late Miocene		5.333
		Tortonian												Late Miocene		7.246
		Serravallian				Cenozoic 5								Middle Miocene		11.63
		Langhian												Middle Miocene		13.82
		Burdigalian												Early Miocene		15.98
		Aquitanian												Early Miocene		20.44
Paleogene	Oligocene	Chattian				Cenozoic 4								Late Oligocene		23.03
	Oligocene	Rupelian				Cenozoic 4								Early Oligocene		27.82
	Eocene	Priabonian				Cenozoic 3								Late Eocene		33.9
		Bartonian				Cenozoic 3								Middle Eocene		37.71
		Lutetian				Cenozoic 2								Middle Eocene		41.2
		Ypresian				Cenozoic 2								Early Eocene		47.8
	Paleocene	Thanetian				Cenozoic 1								Late Paleocene		56
		Selandian												Middle Paleocene		59.2
		Danian												Early Paleocene		61.6
Cretaceous	Late Cretaceous	Maastrichtian				Cretaceous 8	Senonian									66
		Campanian				Cretaceous 7										72.1
		Santonian				Cretaceous 6										83.6
		Coniacian														86.3
		Turonian														89.8
		Cenomanian				Cretaceous 5										93.9
	Early Cretaceous	Albian				Cretaceous 4	Gallic									100.5
		Aptian				Cretaceous 3										113
		Barremian				Cretaceous 2										121.4
		Hauterivian				Cretaceous 2	Neocomian									125.77
		Valanginian				Cretaceous 1										132.6
		Berriasian				Cretaceous 1										139.8
Jurassic	Late Jurassic	Tithonian				Jurassic 6										145
		Kimmeridgian				Jurassic 5										149.2
		Oxfordian														154.8
	Middle Jurassic	Callovian														161.5
		Bathonian				Jurassic 4										165.3
		Bajocian									Epizigzagiceras					168.2
		Bajocian									Rotundum/Oblatum/Kirschneri/Crassicostatus/Widebayense					168.4
		Aalenian				Jurassic 3					Howelli/Scissum/Westermanni					170.9
	Early Jurassic	Toarcian									Yakounensis/Hillebrandti/Crassicosta					174.7
											Planulata					179.3 *
											Planulata		Arnioceras arnouldi			179.8 *
											Kanense					181.3 *
											Carlottense					182.3 *
											Kunae					183.5 *
		Pliensbachian				Jurassic 2					Kunae					184.2
											Freboldi					185.1 *
											Whiteavesi/Imlayi	Tetraspidoceras				186.2 *
												Tetraspidoceras				189.2 *
											Plesechioceras harbledownense/Asteroceras varians/Coroniceras	Canadensis				190.3 *
		Sinemurian				Jurassic 1										192.9
											Pseudaetomoceras		Psiloceras			196.4 *
											Franziceras/Euphyllites					196.5 *
		Hettangian									Franziceras/Euphyllites					199.5
Triassic	Late Triassic	Rhaetian				Triassic 4										201.4
		Norian				Triassic 4										208.5
		Carnian				Triassic 3										227
	Middle Triassic	Ladinian				Triassic 2										237
	Middle Triassic	Anisian				Triassic 2										242
	Early Triassic	Olenekian		Triassic 1	247.2
		Induan			251.2
		Induan			Kathwai	251.5 *
Permian	Lopingian	Changhsingian		Permian 4	Kathwai	251.902
						252.4 *
					Chhidru	252.9 *
		Wuchiapingian			Chhidru	Longtanian †		254.14
					Kalabagh			255 *
					Wargal			256 *
	Guadalupian	Capitanian						259.51
		Wordian						264.28
								265.3 *
					Amb			266.1 *
		Roadian		Permian 3	Amb			266.9
		Roadian		Permian 3				270.7 *
	Cisuralian	Kungurian		Permian 2				273.01
		Artinskian						283.5
		Sakmarian						290.1
		Asselian		Permian 1				293.52
Carboniferous	Pennsylvanian	Gzhelian		Carboniferous 5				298.9
		Kasimovian		Carboniferous 5				303.7
		Moscovian		Carboniferous 4				307
		Bashkirian		Carboniferous 4				315.2
	Mississippian	Serpukhovian		Carboniferous 3				323.2
		Visean	Carboniferous 2	330.9
		Tournaisian	Carboniferous 1	346.7
Devonian	Late Devonian	Famennian	Devonian 5	358.9
	Late Devonian	Frasnian	Devonian 4	372.2
	Middle Devonian	Givetian	Devonian 3	382.7
	Middle Devonian	Eifelian	Devonian 3	387.7
	Early Devonian	Emsian	Devonian 2	393.3
		Pragian	Devonian 1	407.6
		Lochkovian	Devonian 1	410.8
Silurian	Pridoli		Silurian 2	Cayugan				419.2
	Pridoli			Niagaran				422.5 *
	Ludlow	Ludfordian						423
	Ludlow	Gorstian					425.6
	Wenlock	Homerian					Lockportian	Gleedonian	427.4
		Homerian					Lockportian	Whitwellian	429.7 *
		Sheinwoodian							430.5
	Llandovery	Telychian	Silurian 1				Ontarian		433.4
		Aeronian							438.5
									Alexandrian	438.7 *
				Medinan			Clinton			440.1 *
										440.7 *
		Rhuddanian								440.8
Ordovician	Late Ordovician	Hirnantian	Ordovician 5							443.8
		Katian	Ordovician 5							445.2
		Sandbian	Ordovician 4							453
	Middle Ordovician	Darriwilian	Ordovician 3							458.4
	Middle Ordovician	Dapingian	Ordovician 2							467.3
	Early Ordovician	Floian	Ordovician 2							470
	Early Ordovician	Tremadocian	Ordovician 1							477.7
Cambrian	Furongian	Stage 10	Cambrian 5							Franconian †/Dresbachian/Millardan				485.4
		Stage 10												Sunwaptan	487.5
		Jiangshanian												Sunwaptan	489.5
		Jiangshanian												Steptoean	493 *
		Paibian										494		Steptoean
	Miaolingian	Guzhangian	Series 3 †							Cambrian 4		Marjumian		Albertian †	497
		Drumian								Cambrian 4	500.5	Marjumian
		Wuliuan				Stage 5 †				Cambrian 3	Topazan	504.5
		Wuliuan				Stage 5 †					Delamaran	506.5
	Series 2	Stage 4									Delamaran	Waucoban †	509
		Stage 4									Dyeran		511 *
		Stage 3								Cambrian 2	Dyeran		514
											Montezuman		514.8 *
											Begadean		519.9 *
	Terreneuvian	Stage 2											521
	Terreneuvian	Fortunian								Cambrian 1			529
																538.8