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
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
B. D. Webby. 1998. Steps toward a global standard for Ordovician stratigraphy. Newsletters in Stratigraphy 36:1-33 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			Ordovician of Australia	Ammonite Chrons of North America			Ordovician of Britain
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					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
	Early Triassic	Induan											251.2
Permian	Lopingian	Changhsingian											251.902
	Lopingian	Wuchiapingian		Longtanian †									254.14
	Guadalupian	Capitanian											259.51
		Wordian											264.28
		Roadian											266.9
	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		419.2
	Ludlow	Ludfordian	423
	Ludlow	Gorstian	425.6
	Wenlock	Homerian	427.4
	Wenlock	Sheinwoodian	430.5
	Llandovery	Telychian	433.4
		Aeronian	438.5
		Rhuddanian	440.8
Ordovician	Late Ordovician	Hirnantian	Bolindian		Ashgill	Hirnantian				443.8
		Katian				Rawtheyan				445.2
						Cautleyan				448.9 *
			Eastonian			Cautleyan				449 *
						Pusgillian				449.3 *
					Caradoc	Streffordian				Onnian †	449.6 *
						Cheneyan					451.5 *
			Gisbornian			Cheneyan					452 *
						Burrellian					452.7 *
		Sandbian									453
										Actonian †	453.2 *
										Marshbrookian †	Woolstonian †	454.2 *
										Longvillian †		455.2 *
						Aurelucian				Longvillian †		456.8 *
						Aurelucian				Soudleyan †/Harnagian/Costonian		457.4 *
	Middle Ordovician	Darriwilian	Darriwilian		Llanvirn	Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn						458.4
		Darriwilian	Darriwilian			Abereiddian/Early Llanvirn						461.3 *
		Dapingian	Yapeenian			Abereiddian/Early Llanvirn						467.3
			Yapeenian		Arenig	Fennian						468.4 *
			Castlemainian									468.5 *
	Early Ordovician	Floian	Chewtonian									470
			Chewtonian			Whitlandian						471.1 *
			Bendigonian									471.8 *
			Lancefieldian									473.5 *
						Moridunian		474.3 *
		Tremadocian			Tremadoc	Migneintian		477.7
						Cressagian	480.8 *
			Warendian			Cressagian	482.8 *
			Warendian				485 *
Cambrian	Furongian	Stage 10					485.4
		Jiangshanian					489.5
		Paibian					494
	Miaolingian	Guzhangian					Series 3 †	497
		Drumian						500.5
		Wuliuan		Stage 5 †				504.5
													509