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

Show more time

Show linear time

International Chronostratigraphic Timescale			Obsolete Names for ICS Units			Carboniferous of China	Devonian of Czechoslovakia	Cretaceous Subepochs	Cambrian of North America		Permian of the Salt Range	Ammonite Chrons of North America			Cenozoic Subepochs
Quaternary	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													Middle Miocene	11.63
		Langhian													Middle Miocene	13.82
		Burdigalian													Early Miocene	15.98
		Aquitanian													Early Miocene	20.44
Paleogene	Oligocene	Chattian													Late Oligocene	23.03
	Oligocene	Rupelian													Early Oligocene	27.82
	Eocene	Priabonian													Late Eocene	33.9
		Bartonian													Middle Eocene	37.71
		Lutetian													Middle Eocene	41.2
		Ypresian													Early Eocene	47.8
	Paleocene	Thanetian													Late Paleocene	56
		Selandian													Middle Paleocene	59.2
		Danian													Early Paleocene	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										Epizigzagiceras				168.2
		Bajocian										Rotundum/Oblatum/Kirschneri/Crassicostatus/Widebayense				168.4
		Aalenian										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										Kunae				184.2
												Freboldi				185.1 *
												Whiteavesi/Imlayi	Tetraspidoceras			186.2 *
													Tetraspidoceras			189.2 *
												Plesechioceras harbledownense/Asteroceras varians/Coroniceras	Canadensis			190.3 *
		Sinemurian														192.9
												Pseudaetomoceras		Psiloceras		196.4 *
												Franziceras/Euphyllites				196.5 *
		Hettangian										Franziceras/Euphyllites				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		251.902							Kathwai
					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		Amb		266.9
		Roadian				270.7 *
	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				Srbsko	382.7
	Middle Devonian	Eifelian				Chotec	387.7
	Early Devonian	Emsian				Daleje/Zlichovian	393.3
		Pragian				Pragian	407.6
		Lochkovian				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						Lockportian	Whitwellian	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									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									Franconian †/Dresbachian/Millardan	485.4
		Stage 10										Sunwaptan	487.5
		Jiangshanian										Sunwaptan	489.5
		Jiangshanian										Steptoean	493 *
		Paibian										Steptoean	494
	Miaolingian	Guzhangian									Series 3 †	Marjumian	Albertian †	497
		Drumian										Marjumian		500.5
		Wuliuan			Stage 5 †							Topazan		504.5
		Wuliuan			Stage 5 †							Delamaran		506.5
	Series 2	Stage 4										Delamaran	Waucoban †	509
		Stage 4										Dyeran		511 *
		Stage 3										Dyeran		514
												Montezuman		514.8 *
												Begadean		519.9 *
	Terreneuvian	Stage 2												521
	Terreneuvian	Fortunian												529
																538.8