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, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 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, J. G. Ogg, M. D. Schmitz and G. M. Ogg. 2020. Geologic Time Scale 2020 view
B. D. Webby. 1998. Steps toward a global standard for Ordovician stratigraphy. Newsletters in Stratigraphy 36:1-33 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 126762 collections

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International Chronostratigraphic Timescale					Carboniferous Subepochs	Precambrian of Russia	Cambrian of North America		Silurian Ages of Europe	Ordovician of Britain				Ordovician of Australia
Phanerozoic	Paleozoic	Carboniferous	Pennsylvanian	Gzhelian	Late Pennsylvanian										298.9
				Kasimovian	Late Pennsylvanian										303.7
				Moscovian	Middle Pennsylvanian										307
				Bashkirian	Early Pennsylvanian										315.2
			Mississippian	Serpukhovian	Late Mississippian										323.2
				Visean	Middle Mississippian										330.9
				Tournaisian	Early Mississippian										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					Gleedonian						427.4
				Homerian					Whitwellian						429.7 *
				Sheinwoodian											430.5
			Llandovery	Telychian											433.4
				Aeronian											438.5
				Rhuddanian											440.8
		Ordovician	Late Ordovician	Hirnantian						Ashgill	Hirnantian			Bolindian	443.8
				Katian							Rawtheyan				445.2
											Cautleyan				448.9 *
											Cautleyan			Eastonian	449 *
											Pusgillian				449.3 *
										Caradoc	Streffordian	Onnian †			449.6 *
											Cheneyan				451.5 *
											Cheneyan			Gisbornian	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						Llanvirn	Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn			Darriwilian	458.4
				Darriwilian							Abereiddian/Early Llanvirn			Darriwilian	461.3 *
				Dapingian							Abereiddian/Early Llanvirn			Yapeenian	467.3
										Arenig	Fennian			Yapeenian	468.4 *
														Castlemainian	468.5 *
			Early Ordovician	Floian										Chewtonian	470
											Whitlandian			Chewtonian	471.1 *
														Bendigonian	471.8 *
														Lancefieldian	473.5 *
											Moridunian				474.3 *
				Tremadocian						Tremadoc	Migneintian				477.7
											Cressagian				480.8 *
											Cressagian			Warendian	482.8 *
														Warendian	485 *
		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
Proterozoic	Neoproterozoic	Ediacaran				Vendian									538.8
		Cryogenian													635
		Tonian													720
		Tonian			Karatau	800
	Mesoproterozoic	Stenian			Karatau	1000
		Stenian			Yurmatian	1100
		Ectasian			Yurmatian	1200
		Ectasian			Burzyan	1375
															1400