PBDB Timescale

International Chronostratigraphic Timescale

The interval definitions in this timescale are derived from the following sources:

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
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
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
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, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 view

There are 59 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 126831 collections

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International Chronostratigraphic Timescale			Ordovician of Ibero-Bohemia				Ordovician of Australia	Cretaceous Subepochs	Carboniferous of Western Europe		Devonian Subages	Mesozoic Subages		Carboniferous Subepochs
Cretaceous	Late Cretaceous	Maastrichtian						Senonian				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						Gallic				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						Neocomian				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										Late Bajocian			168.2
		Bajocian										Early Bajocian			168.6 *
		Aalenian										Late Aalenian/Middle Aalenian/Early Aalenian			170.9
	Early Jurassic	Toarcian										Late Toarcian			174.7
												Middle Toarcian			180.4 *
												Early Toarcian			182.9 *
		Pliensbachian										Late Pliensbachian/Early Pliensbachian			184.2
		Sinemurian										Late Sinemurian/Early Sinemurian			192.9
		Hettangian										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													251.902
	Lopingian	Wuchiapingian													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
		Asselian							Kuzel						297.7
Carboniferous	Pennsylvanian	Gzhelian							Kuzel					Late Pennsylvanian	298.9
									Stephanian	Stephanian C					300.3 *
										Stephanian B					300.9 *
										Stephanian A					301.4 *
		Kasimovian	303.7							Stephanian A
		Kasimovian	Cantabrian	305 *
		Moscovian	Cantabrian	Middle Pennsylvanian	307
			Westphalian		Westphalian D	307.4 *
					Westphalian C	309.8
					Westphalian B	314.6
		Bashkirian		Early Pennsylvanian	Westphalian B	315.2
					Westphalian A	317 *
			Namurian		Yeadonian	318.8 *
					Marsdenian	320.2 *
					Kinderscoutian	321.5 *
					Alportian	322 *
					Chokierian	323.1 *
	Mississippian	Serpukhovian		Late Mississippian	Chokierian	323.2
					Arnsbergian	324 *
					Pendleian	327.4 *
		Visean	Warnantian	Brigantian †	Middle Mississippian	330.9
			Livian	Asbian †		336.3 *
			Moliniacian	Holkerian †/Arundian/Chadian		340.2 *
		Tournaisian	Ivorian		Early Mississippian	346.7
		Tournaisian	Hastarian		Early Mississippian	353.7 *
Devonian	Late Devonian	Famennian			Late Famennian		358.9
					Middle Famennian		365.3 *
					Early Famennian		368.5 *
		Frasnian			Late Frasnian		372.2
					Middle Frasnian		375.4 *
					Early Frasnian		379.3 *
	Middle Devonian	Givetian			Late Givetian		382.7
					Middle Givetian		383.7 *
					Early Givetian		385.9 *
		Eifelian			Late Eifelian		387.7
		Eifelian			Early Eifelian		390.3 *
	Early Devonian	Emsian			Late Emsian		393.3
		Emsian			Early Emsian		398.3 *
		Pragian			Pragian		407.6
		Lochkovian			Late Lochkovian		410.8
					Middle Lochkovian		412.8 *
					Early Lochkovian		415.6 *
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					Kosovian	Bolindian	443.8
		Katian					Kralodvorian	Bolindian	Bohdalec †	445.2
							Kralodvorian	Eastonian		449 *
							Berounian	Eastonian		449.7 *
								Gisbornian		452 *
		Sandbian								453
										Zahorany †/Vinice	Letna †	456.2 *
									Liben †			458 *
	Middle Ordovician	Darriwilian						Darriwilian				458.4
							Dobrotivian					458.5 *
							Oretanian					459.7 *
									Sarka †			461.7 *
		Dapingian						Klabava †	Yapeenian			467.3
							Arenigian		Yapeenian			468
									Castlemainian			468.5 *
	Early Ordovician	Floian							Chewtonian			470
									Bendigonian			471.8 *
									Lancefieldian			473.5 *
		Tremadocian					Tremadocian		Lancefieldian			477.7
		Tremadocian					Tremadocian		Warendian			482.8 *
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										Marjumian	Albertian †	497
		Drumian										Marjumian		500.5
		Wuliuan										Topazan		504.5
		Wuliuan										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