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, F. P. Agterberg, J. G. Ogg, J. Hardenbol, P. Van Veen, J. Thierry, and Z. Huang. 1995. A Triassic, Jurassic, and Cretaceous time scale. SEPM Special Publication 54 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
F. M. Gradstein, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 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			Mesozoic Subages		Silurian Ages of Europe	Ordovician of Britain				Ten Million Year Bins
Quaternary	Holocene	Meghalayan											Cenozoic 6	0
		Northgrippian												0.0042
		Greenlandian												0.0082
	Pleistocene	Late Pleistocene												0.0117
		Chibanian												0.129
		Calabrian												0.774
		Gelasian												1.8
Neogene	Pliocene	Piacenzian	Tertiary †											2.58
	Pliocene	Zanclean												3.6
	Miocene	Messinian												5.333
		Tortonian												7.246
		Serravallian											Cenozoic 5	11.63
		Langhian												13.82
		Burdigalian												15.98
		Aquitanian												20.44
Paleogene	Oligocene	Chattian											Cenozoic 4	23.03
	Oligocene	Rupelian											Cenozoic 4	27.82
	Eocene	Priabonian											Cenozoic 3	33.9
		Bartonian											Cenozoic 3	37.71
		Lutetian											Cenozoic 2	41.2
		Ypresian											Cenozoic 2	47.8
	Paleocene	Thanetian											Cenozoic 1	56
		Selandian												59.2
		Danian												61.6
Cretaceous	Late Cretaceous	Maastrichtian				Late Maastrichtian/Early Maastrichtian							Cretaceous 8	66
		Campanian				Late Campanian/Middle Campanian/Early Campanian							Cretaceous 7	72.1
		Santonian				Late Santonian/Middle Santonian/Early Santonian							Cretaceous 6	83.6
		Coniacian				Late Coniacian/Middle Coniacian/Early Coniacian								86.3
		Turonian				Late Turonian/Middle Turonian/Early Turonian								89.8
		Cenomanian				Late Cenomanian/Middle Cenomanian/Early Cenomanian							Cretaceous 5	93.9
	Early Cretaceous	Albian				Late Albian							Cretaceous 4	100.5
						Middle Albian								106.2 *
						Early Albian								109.9 *
		Aptian				Late Aptian							Cretaceous 3	113
		Aptian				Early Aptian							Cretaceous 3	119.5 *
		Barremian				Late Barremian/Early Barremian							Cretaceous 2	121.4
		Hauterivian				Late Hauterivian/Early Hauterivian							Cretaceous 2	125.77
		Valanginian				Late Valanginian/Early Valanginian							Cretaceous 1	132.6
		Berriasian				Late Berriasian								139.8
						Middle Berriasian								140.6 *
						Early Berriasian								142.7 *
Jurassic	Late Jurassic	Tithonian				Late Tithonian	Middle Tithonian						Jurassic 6	145
		Tithonian				Early Tithonian	Middle Tithonian						Jurassic 6	146.3 *
		Kimmeridgian				Late Kimmeridgian							Jurassic 5	149.2
		Kimmeridgian				Early Kimmeridgian								152.2 *
		Oxfordian				Late Oxfordian	Middle Oxfordian/Early Oxfordian							154.8
		Oxfordian					Middle Oxfordian/Early Oxfordian							157.9 *
	Middle Jurassic	Callovian				Late Callovian/Middle Callovian/Early Callovian								161.5
		Bathonian				Late Bathonian/Middle Bathonian/Early Bathonian							Jurassic 4	165.3
		Bajocian				Late Bajocian								168.2
		Bajocian				Early Bajocian								168.6 *
		Aalenian				Late Aalenian/Middle Aalenian/Early Aalenian							Jurassic 3	170.9
	Early Jurassic	Toarcian				Late Toarcian								174.7
						Middle Toarcian								180.4 *
						Early Toarcian								182.9 *
		Pliensbachian				Late Pliensbachian/Early Pliensbachian							Jurassic 2	184.2
		Sinemurian				Late Sinemurian/Early Sinemurian							Jurassic 1	192.9
		Hettangian				Late Hettangian/Middle Hettangian/Early Hettangian							Jurassic 1	199.5
Triassic	Late Triassic	Rhaetian											Triassic 4	201.4
		Norian				Sevatian								208.5
						Alaunian								213.2 *
						Lacian								216.7 *
		Carnian				Tuvalian							Triassic 3	227
		Carnian				Julian							Triassic 3	233.4 *
	Middle Triassic	Ladinian		Longobardian	Triassic 2	237
		Ladinian		Fassanian		239.7 *
		Anisian		Illyrian		242
				Pelsonian		243.8 *
				Bithynian		244.7 *
				Aegean		245.5 *
	Early Triassic	Olenekian		Spathian	Triassic 1	247.2
		Olenekian		Smithian		248.9 *
		Induan		Dienerian		251.2
		Induan		Griesbachian		251.4 *
Permian	Lopingian	Changhsingian			Permian 4	251.902
	Lopingian	Wuchiapingian				Longtanian †		254.14
	Guadalupian	Capitanian						259.51
		Wordian						264.28
		Roadian			Permian 3			266.9
	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		419.2
	Ludlow	Ludfordian			423
	Ludlow	Gorstian			425.6
	Wenlock	Homerian			Gleedonian			427.4
		Homerian			Whitwellian			429.7 *
		Sheinwoodian						430.5
	Llandovery	Telychian	Silurian 1					433.4
		Aeronian						438.5
		Rhuddanian						440.8
Ordovician	Late Ordovician	Hirnantian	Ashgill					Hirnantian	Ordovician 5	443.8
		Katian						Rawtheyan		445.2
								Cautleyan		448.9 *
								Pusgillian		449.3 *
			Caradoc					Streffordian		Onnian †	449.6 *
							Cheneyan	451.5 *
							Burrellian	452.7 *
		Sandbian						Ordovician 4	453
									Actonian †	453.2 *
									Marshbrookian †	Woolstonian †	454.2 *
									Longvillian †		455.2 *
							Aurelucian		Longvillian †		456.8 *
							Aurelucian		Soudleyan †/Harnagian/Costonian		457.4 *
	Middle Ordovician	Darriwilian	Llanvirn				Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn		Ordovician 3		458.4
		Darriwilian					Abereiddian/Early Llanvirn		Ordovician 3		461.3 *
		Dapingian					Abereiddian/Early Llanvirn		Ordovician 2		467.3
		Dapingian	Arenig				Fennian				468.4 *
	Early Ordovician	Floian					Fennian				470
							Whitlandian				471.1 *
							Moridunian				474.3 *
		Tremadocian	Tremadoc				Migneintian		Ordovician 1		477.7
			Tremadoc				Cressagian				480.8 *
											485 *
Cambrian	Furongian	Stage 10							Cambrian 5		Late Cambrian	485.4
		Jiangshanian										489.5
		Paibian										494
	Miaolingian	Guzhangian							Series 3 †		Cambrian 4	Middle Cambrian	497
		Drumian									Cambrian 4		500.5
		Wuliuan				Stage 5 †					Cambrian 3		504.5
	Series 2	Stage 4									Cambrian 3	Early Cambrian	509
	Series 2	Stage 3									Cambrian 2		514
	Terreneuvian	Stage 2									Cambrian 2		521
	Terreneuvian	Fortunian		Cambrian 1							529
														538.8