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

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 of China	Devonian Subages	Ordovician of Ibero-Bohemia
Carboniferous	Pennsylvanian	Gzhelian	Xiaodushanian						300 *
		Kasimovian	Xiaodushanian						303.7
		Kasimovian	Dalaun						305.8 *
		Moscovian							307
		Bashkirian							315.2
			Huashibanian						318.5 *
			Lousuan						321.2 *
	Mississippian	Serpukhovian	Dewunian						323.2
		Serpukhovian	Shangsian						330.8 *
		Visean	Shangsian						330.9
		Visean	Jiusian						335 *
		Tournaisian	Tangbagouan						346.7
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				443.8
		Katian			Kralodvorian	Bohdalec †			445.2
		Katian			Berounian				449.7 *
		Sandbian							453
							Zahorany †/Vinice	Letna †	456.2 *
						Liben †			458 *
	Middle Ordovician	Darriwilian							458.4
					Dobrotivian				458.5 *
					Oretanian				459.7 *
						Sarka †			461.7 *
		Dapingian				Klabava †			467.3
		Dapingian			Arenigian				468
	Early Ordovician	Floian			Arenigian				470
	Early Ordovician	Tremadocian			Tremadocian				477.7
									485.4