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
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

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			Devonian Subages	Devonian of Eastern North America		Ammonite Chrons of Northwest Europe		Mesozoic Subages		Silurian of the Baltic
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									Late Maastrichtian/Early Maastrichtian			66
		Campanian									Late Campanian/Middle Campanian/Early Campanian			72.1
		Santonian									Late Santonian/Middle Santonian/Early Santonian			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			93.9
	Early Cretaceous	Albian									Late Albian			100.5
											Middle Albian			106.2 *
											Early Albian			109.9 *
		Aptian									Late Aptian			113
		Aptian									Early Aptian			119.5 *
		Barremian									Late Barremian/Early Barremian			121.4
		Hauterivian									Late Hauterivian/Early Hauterivian			125.77
		Valanginian									Late Valanginian/Early Valanginian			132.6
		Berriasian									Late Berriasian			139.8
											Middle Berriasian			140.6 *
											Early Berriasian			142.7 *
Jurassic	Late Jurassic	Tithonian									Late Tithonian	Middle Tithonian		145
		Tithonian									Early Tithonian	Middle Tithonian		146.3 *
		Kimmeridgian									Late Kimmeridgian			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			165.3
		Bajocian							Parkinsoni/Garantiana/Subfurcatum/Sauzei/Laeviuscula/Discites		Late Bajocian			168.2
										Humphresianum	Late Bajocian			168.4
										Humphresianum	Early Bajocian			168.6 *
		Aalenian							Concavum/Murchisonae/Opalinum		Late Aalenian/Middle Aalenian/Early Aalenian			170.9
	Early Jurassic	Toarcian							Levesquei/Variabilis/Bifrons	Thouarsense	Late Toarcian			174.7
											Late Toarcian			180.1
											Middle Toarcian			180.4 *
									Serpentinum/Falciferum/Tenuicostatum		Middle Toarcian			182
									Serpentinum/Falciferum/Tenuicostatum		Early Toarcian			182.9 *
		Pliensbachian							Spinatum/Margaritatus/Davoei/Ibex/Jamesoni		Late Pliensbachian/Early Pliensbachian			184.2
		Sinemurian							Raricostatum/Oxynotum/Obtusum/Turneri/Semicostatum/Bucklandi		Late Sinemurian/Early Sinemurian			192.9
		Hettangian							Angulata/Liasicus/Planorbis		Late Hettangian/Middle Hettangian/Early Hettangian			199.5
Triassic	Late Triassic	Rhaetian												201.4
		Norian									Sevatian			208.5
											Alaunian			213.2 *
											Lacian			216.7 *
		Carnian									Tuvalian			227
		Carnian									Julian			233.4 *
	Middle Triassic	Ladinian									Longobardian			237
		Ladinian									Fassanian			239.7 *
		Anisian									Illyrian			242
											Pelsonian			243.8 *
				Bithynian	244.7 *
				Aegean	245.5 *
	Early Triassic	Olenekian		Spathian	247.2
		Olenekian		Smithian	248.9 *
		Induan		Dienerian	251.2
		Induan		Griesbachian	251.4 *
Permian	Lopingian	Changhsingian			Melekhovian	251.902
	Lopingian	Wuchiapingian				Longtanian †	254.14
	Guadalupian	Capitanian					259.51
		Wordian					264.28
		Wordian			Noginskian		264.9 *
		Roadian					266.9
	Cisuralian	Kungurian					273.01
		Kungurian			Pavlovoposadian		276.8 *
		Artinskian			Pavlovoposadian		283.5
		Artinskian			Rusavkinian		287.6 *
		Sakmarian					290.1
		Asselian	293.52
Carboniferous	Pennsylvanian	Gzhelian	298.9
		Kasimovian	Dorogomilovian		303.7
			Khamovnikian		304.8
			Krevyakinian		305.8 *
		Moscovian	Myachkovian		307
			Podolskian		308.9 *
			Kashirian		311.4 *
			Vereian		313.8
			Melekessian		314.8
		Bashkirian	Melekessian		315.2
			Cheremshanian		316.9 *
			Prikamian		318.6 *
			Severokeltmian		319.9 *
			Krasnopolyanian		321.2 *
			Voznesenian		321.9 *
	Mississippian	Serpukhovian	Zapaltjubian		323.2
			Protvian		324.4 *
			Steshevian		326.8 *
			Tarusian		329 *
		Visean	Venevian		330.9
			Mikhailovian		331.9 *
			Aleksinian		333.7 *
			Tulian		335.8 *
			Bobrikian		339.9 *
			Radaevkian		343.4 *
		Tournaisian	Kosvian		346.7
			Kizelian		350.7 *
			Cherepetian		351.9 *
			Karakubian		354.4 *
			Upinian		356.3 *
			Malevkian		357.6 *
			Gumerovian		358 *
Devonian	Late Devonian	Famennian	Late Famennian		Conewangan/Conneautan/Canadaway			358.9
			Middle Famennian					365.3 *
			Early Famennian					368.5 *
		Frasnian	Late Frasnian		West Fallsian/Sonyean			372.2
			Middle Frasnian					375.4 *
			Early Frasnian					379.3 *
	Middle Devonian	Givetian	Late Givetian		Geneseean/Taghanican/Tioughniogan			Cazenovian	382.7
			Middle Givetian						383.7 *
			Early Givetian						385.9 *
		Eifelian	Late Eifelian		Southwoodian				387.7
		Eifelian	Early Eifelian		Southwoodian				390.3 *
	Early Devonian	Emsian	Late Emsian		Sawkillian/Deer Parkian			Helderbergian	393.3
		Emsian	Early Emsian		Sawkillian/Deer Parkian				398.3 *
		Pragian	Pragian						407.6
		Lochkovian	Late Lochkovian						410.8
			Middle Lochkovian						412.8 *
			Early Lochkovian						415.6 *
Silurian	Pridoli								Ohesaare	Cayugan	419.2
									Kaugetuma	Cayugan	421.7 *
									Kaugetuma	Niagaran	422.5 *
	Ludlow	Ludfordian		Kuressaare					423
		Ludfordian		Paadla					423.4 *
		Gorstian		Paadla		425.6
	Wenlock	Homerian		Rootsikula		Lockportian			427.4
		Homerian		Jaagarahu		Lockportian			429.2 *
		Sheinwoodian		Jaagarahu					430.5
		Sheinwoodian		Jaani					431.8 *
	Llandovery	Telychian		Jaani		Ontarian			433.4
		Telychian		Adavere					434 *
		Aeronian							438.5
									Alexandrian		438.7 *
				Raikkula							439.4 *
						Medinan				Clinton	440.1 *
											440.7 *
		Rhuddanian									440.8
		Rhuddanian		Juuru							441.4 *
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									485.4
		Jiangshanian									489.5
		Paibian									494
	Miaolingian	Guzhangian									Series 3 †	497
		Drumian										500.5
		Wuliuan										Stage 5 †	504.5
														509