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
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
F. M. Gradstein, J. G. Ogg, M. D. Schmitz and G. M. Ogg. 2020. Geologic Time Scale 2020 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			Cambrian of Britain		Carboniferous of Western Europe		Devonian of Germany	Silurian of the Baltic
Permian	Cisuralian	Asselian			Kuzel				297.7
Carboniferous	Pennsylvanian	Gzhelian			Kuzel				298.9
					Stephanian	Stephanian C			300.3 *
						Stephanian B			300.9 *
						Stephanian A			301.4 *
		Kasimovian				Stephanian A			303.7
		Kasimovian				Cantabrian			305 *
		Moscovian				Cantabrian			307
					Westphalian	Westphalian D			307.4 *
						Westphalian C			309.8
						Westphalian B			314.6
		Bashkirian				Westphalian B			315.2
						Westphalian A			317 *
					Namurian	Yeadonian			318.8 *
						Marsdenian			320.2 *
						Kinderscoutian			321.5 *
						Alportian			322 *
						Chokierian			323.1 *
	Mississippian	Serpukhovian				Chokierian			323.2
						Arnsbergian			324 *
						Pendleian			327.4 *
		Visean			Warnantian	Brigantian †			330.9
					Livian	Asbian †			336.3 *
					Moliniacian	Holkerian †/Arundian/Chadian			340.2 *
		Tournaisian			Ivorian				346.7
		Tournaisian			Hastarian				353.7 *
Devonian	Late Devonian	Famennian					Wocklum/Dasberg/Hemberg/Nehden		358.9
	Late Devonian	Frasnian					Adorf		372.2
	Middle Devonian	Givetian					Givetian		382.7
	Middle Devonian	Eifelian					Eifelian		387.7
	Early Devonian	Emsian					Emsian		393.3
		Pragian					Siegen		407.6
		Lochkovian					Gedinnine		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	427.4
		Homerian						Jaagarahu	429.2 *
		Sheinwoodian						Jaagarahu	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							443.8
		Katian							445.2
		Sandbian							453
	Middle Ordovician	Darriwilian							458.4
	Middle Ordovician	Dapingian							467.3
	Early Ordovician	Floian							470
	Early Ordovician	Tremadocian							477.7
Cambrian	Furongian	Stage 10	Merioneth	Dolgellian/Trempealeauan					485.4
		Stage 10		Festiniogian					489.2 *
		Jiangshanian		Festiniogian					489.5
		Jiangshanian		Maentwrogian					493.1 *
		Paibian		Maentwrogian					494
	Miaolingian	Guzhangian	St Davids						497
		Drumian							500.5
		Wuliuan							504.5
	Series 2	Stage 4	Caerfai						509
	Series 2	Stage 3							514
	Terreneuvian	Stage 2							521
	Terreneuvian	Fortunian							529
									538.8