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
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
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 126778 collections

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International Chronostratigraphic Timescale			Silurian of the Baltic	Obsolete Carboniferous Ages of China	Silurian Ages of Europe	Carboniferous Subepochs	Ordovician of Britain				Ordovician of Australia
Carboniferous	Pennsylvanian	Gzhelian		Mapingian †		Late Pennsylvanian						298.9
		Kasimovian		Mapingian †								303.7
		Kasimovian										305.9
		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		Ohesaare									419.2
	Pridoli		Kaugetuma									421.7 *
	Ludlow	Ludfordian	Kuressaare									423
		Ludfordian	Paadla									423.4 *
		Gorstian	Paadla									425.6
	Wenlock	Homerian	Rootsikula		Gleedonian							427.4
			Jaagarahu		Gleedonian							429.2 *
					Whitwellian							429.7 *
		Sheinwoodian										430.5
		Sheinwoodian	Jaani									431.8 *
	Llandovery	Telychian	Jaani									433.4
		Telychian	Adavere									434 *
		Aeronian	Adavere									438.5
		Aeronian	Raikkula									439.4 *
		Rhuddanian	Raikkula									440.8
		Rhuddanian	Juuru									441.4 *
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 *
												485.4