PBDB Interval

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
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
A. G. Sennikov and V. K. Golubev. 2006. Vyazniki Biotic Assemblage of the Terminal Permian. Paleontological Journal 40(suppl. 4):S475-S481 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 127660 collections

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International Chronostratigraphic Timescale					Carboniferous of North America	Permian of the Russian Platform		Obsolete Precambrian Ages		Cambrian of Australia	Cambrian of Kazakhstan	Permo-Triassic Subages of Eastern Europe	Ordovician of Australia	Ordovician of Britain
Phanerozoic	Mesozoic	Triassic	Early Triassic	Olenekian								Vokhmian						247.2
	Mesozoic	Triassic	Early Triassic	Induan								Vokhmian						251.2
	Paleozoic	Permian	Lopingian	Changhsingian														251.902
				Wuchiapingian								Late Vyatkian/Early Vyatkian						254.14
				Wuchiapingian		Tatarian	Vyatkian					Late Vyatkian/Early Vyatkian						256.8 *
			Guadalupian	Capitanian			Severodvinian					Late Severodvinian/Early Severodvinian						259.51
				Wordian			Urzhumian					Late Urzhumian/Early Urzhumian						264.28
				Roadian		Kazanian	Povolzhian					Late Kazanian/Early Kazanian						266.9
				Roadian		Kazanian	Sokian					Late Kazanian/Early Kazanian						270.7 *
			Cisuralian	Kungurian		Kungurian	Irenian/Ufimian											273.01
							Filipovian											276.5 *
							Saraninian											280.1 *
				Artinskian		Artinskian	Sarginian											283.5
							Irginian											285.9 *
							Burtsevian											287.8 *
				Sakmarian		Sakmarian	Sterlitamakian											290.1
				Sakmarian		Sakmarian	Tastubian											291.7 *
				Asselian	Bursumian †	Asselian	Shikhanian											293.52
							Uskalykian											294.8
							Surenian											297.5
		Carboniferous	Pennsylvanian	Gzhelian	Virgilian													298.9
				Kasimovian	Missourian													303.7
				Kasimovian	Desmoinesian													305.9 *
				Moscovian	Desmoinesian													307
				Moscovian	Atokan													312.7 *
				Bashkirian	Atokan													315.2
				Bashkirian	Morrowan													318.4 *
			Mississippian	Serpukhovian	Chesterian													323.2
				Visean	Chesterian													330.9
					Meramecian													335.8 *
					Osagean													343.1 *
				Tournaisian	Osagean													346.7
				Tournaisian	Kinderhookian													351.9 *
		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
Abereiddian/Early Llanvirn				Darriwilian				461.3 *					Darriwilian
Abereiddian/Early Llanvirn				Dapingian				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	Ungurian			Tremadoc					Migneintian	477.7
									Cressagian	480.8 *
								Warendian	Cressagian	482.8 *
								Warendian		485 *
Cambrian	Furongian	Stage 10	Datsonian					Batyrbaian			485.4
		Stage 10	Payntonian								486.8 *
		Jiangshanian	Iverian								489.5
								Aksaian			490.7 *
								Sakian			492.2 *
		Paibian	Idamean					Sakian			494
	Miaolingian	Guzhangian	Mindyallan					Ayusokkanian			497
			Boomerangian			499		Ayusokkanian
			Boomerangian				499.5
		Drumian	Undillan			Zhanaarykian	500.5
		Drumian	Floran			Tuesaian	503
		Wuliuan	Templetonian			Tuesaian	504.5
			Templetonian				505.3
			Ordian				507.8 *
	Series 2	Stage 4					509
						Toyonian	510 *
						Toyonian	510.8 *
						Botomian	512.5 *
		Stage 3				Botomian	514
		Stage 3				Atdabanian	515.6 *
	Terreneuvian	Stage 2			Tommotian	521
		Stage 2				525.5
		Fortunian				529
Proterozoic	Neoproterozoic	Ediacaran						Vendian †			Poundian †	538.8
Proterozoic	Neoproterozoic	Ediacaran						Vendian †			Wonokan †	571.7 *
																		635