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
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 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 126778 collections

Show more time

Show linear time

International Chronostratigraphic Timescale			Ordovician of the Baltic				Ordovician of Ibero-Bohemia				Ordovician of Britain				Cambrian of West Avalonia	Silurian Ages of Europe	Carboniferous Subepochs	Ordovician of Australia
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	Harju	Porkuni			Kosovian				Ashgill	Hirnantian						Bolindian	443.8
		Katian		Pirgu			Kralodvorian	Bohdalec †				Rawtheyan							445.2
												Cautleyan							448.9 *
												Cautleyan						Eastonian	449 *
												Pusgillian							449.3 *
				Vormsi							Caradoc	Streffordian	Onnian †						449.6 *
				Vormsi			Berounian												449.7 *
				Nabala	Johvi †														450 *
			Viru	Rakvere															450.6 *
				Rakvere								Cheneyan							451.5 *
				Oandu								Cheneyan						Gisbornian	452 *
				Oandu								Burrellian							452.7 *
		Sandbian		Keila	Idavere †														453
				Keila									Actonian †						453.2 *
				Haljala									Actonian †						453.9
													Marshbrookian †	Woolstonian †					454.2 *
													Longvillian †						455.2 *
									Zahorany †/Vinice	Letna †									456.2 *
				Kukruse															456.4 *
												Aurelucian							456.8 *
													Soudleyan †/Harnagian/Costonian						457.4 *
				Uhaku	Aluoja †														457.5 *
								Liben †											458 *
	Middle Ordovician	Darriwilian									Llanvirn	Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn						Darriwilian	458.4
							Dobrotivian												458.5 *
				Lasnamagi			Dobrotivian												458.9 *
				Lasnamagi			Oretanian												459.7 *
				Aseri															460.4 *
												Abereiddian/Early Llanvirn							461.3 *
								Sarka †											461.7 *
			Oeland	Kunda															462.9 *
				Kunda	Valaste †/Hunderum														464.3 *
				Volkhov		Langevoja †/Vaana/Saka													467.1 *
		Dapingian						Klabava †										Yapeenian	467.3
							Arenigian												468
											Arenig	Fennian							468.4 *
																		Castlemainian	468.5 *
				Billingen														Castlemainian	469.3 *
	Early Ordovician	Floian																Chewtonian	470
					Latorp †														470.1 *
												Whitlandian							471.1 *
															Bendigonian			471.8 *
															Lancefieldian			473.5 *
				Hunneberg														473.7 *
												Moridunian						474.3 *
		Tremadocian					Tremadocian				Tremadoc	Migneintian						477.7
												Cressagian						480.8 *
				Varangu														481.3 *
				Pakerort													482.2 *
															Warendian		482.8 *
															Warendian		485 *
Cambrian	Furongian	Stage 10															485.4
																	486.3 *
																	486.5
		Jiangshanian															489.5
		Paibian															494
	Miaolingian	Guzhangian															497
		Guzhangian															Arcadian	498.4
		Drumian																500.5
		Wuliuan																504.5
	Series 2	Stage 4														Branchian	509
		Stage 3														Branchian	514
		Stage 3														Placentian	517.1
	Terreneuvian	Stage 2															521
	Terreneuvian	Fortunian															529
																			538.8