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	Carboniferous of Western Europe		Devonian Subages	Ordovician of Ibero-Bohemia
Permian	Cisuralian	Asselian		Kuzel							297.7
Carboniferous	Pennsylvanian	Gzhelian									298.9
			Xiaodushanian								300 *
				Stephanian	Stephanian C						300.3 *
					Stephanian B						300.9 *
					Stephanian A						301.4 *
		Kasimovian			Stephanian A						303.7
					Cantabrian						305 *
			Dalaun								305.8 *
		Moscovian									307
				Westphalian	Westphalian D						307.4 *
					Westphalian C						309.8
					Westphalian B						314.6
		Bashkirian			Westphalian B						315.2
					Westphalian A						317 *
			Huashibanian		Westphalian A						318.5 *
				Namurian	Yeadonian						318.8 *
					Marsdenian						320.2 *
			Lousuan		Marsdenian						321.2 *
					Kinderscoutian						321.5 *
					Alportian						322 *
					Chokierian						323.1 *
	Mississippian	Serpukhovian	Dewunian		Chokierian						323.2
					Arnsbergian						324 *
					Pendleian						327.4 *
			Shangsian		Pendleian						330.8 *
		Visean	Shangsian	Warnantian	Brigantian †						330.9
			Jiusian	Warnantian	Brigantian †						335 *
				Livian	Asbian †						336.3 *
				Moliniacian	Holkerian †/Arundian/Chadian						340.2 *
		Tournaisian	Tangbagouan	Ivorian							346.7
		Tournaisian	Tangbagouan	Hastarian							353.7 *
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