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
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 126844 collections

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International Chronostratigraphic Timescale			Permian Subages of Germany	Ordovician of the Baltic				Ordovician of Ibero-Bohemia
Permian	Lopingian	Changhsingian	Buntsandstein									251.902
	Lopingian	Wuchiapingian	Buntsandstein									254.14
	Guadalupian	Capitanian	Ohre/Aller									259.51
		Wordian	Leine									264.28
		Roadian										266.9
	Cisuralian	Kungurian										273.01
		Artinskian										283.5
		Sakmarian										290.1
		Asselian										293.52
Carboniferous	Pennsylvanian	Gzhelian										298.9
		Kasimovian										303.7
		Moscovian										307
		Bashkirian										315.2
	Mississippian	Serpukhovian										323.2
		Visean										330.9
		Tournaisian										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										427.4
	Wenlock	Sheinwoodian										430.5
	Llandovery	Telychian										433.4
		Aeronian										438.5
		Rhuddanian										440.8
Ordovician	Late Ordovician	Hirnantian		Harju	Porkuni			Kosovian				443.8
		Katian			Pirgu			Kralodvorian	Bohdalec †			445.2
					Vormsi			Kralodvorian				449.6 *
					Vormsi			Berounian				449.7 *
					Nabala	Johvi †						450 *
				Viru	Rakvere							450.6 *
					Oandu							452 *
		Sandbian			Keila	Idavere †						453
					Haljala							453.9
					Haljala					Zahorany †/Vinice	Letna †	456.2 *
					Kukruse							456.4 *
					Uhaku	Aluoja †						457.5 *
									Liben †			458 *
	Middle Ordovician	Darriwilian										458.4
								Dobrotivian				458.5 *
					Lasnamagi			Dobrotivian				458.9 *
					Lasnamagi			Oretanian				459.7 *
					Aseri							460.4 *
					Aseri				Sarka †			461.7 *
				Oeland	Kunda							462.9 *
					Kunda	Valaste †/Hunderum						464.3 *
					Volkhov		Langevoja †/Vaana/Saka					467.1 *
		Dapingian							Klabava †			467.3
								Arenigian				468
					Billingen							469.3 *
	Early Ordovician	Floian										470
						Latorp †						470.1 *
					Hunneberg							473.7 *
		Tremadocian			Hunneberg			Tremadocian				477.7
					Varangu							481.3 *
					Pakerort							482.2 *
Cambrian	Furongian	Stage 10			Pakerort							485.4
Cambrian	Furongian	Stage 10										486.3 *
												486.5