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			Cambrian of North America		Permian of the Salt Range	Ammonite Chrons of North America			Cenozoic Subepochs	Silurian of North America
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													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							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
		Kasimovian				303.7
		Moscovian				307
		Bashkirian				315.2
	Mississippian	Serpukhovian				323.2
		Visean	330.9
		Tournaisian	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				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								494			Steptoean
	Miaolingian	Guzhangian								Series 3 †		Marjumian	Albertian †	497
		Drumian							500.5			Marjumian
		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