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 126778 collections

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International Chronostratigraphic Timescale			Silurian Ages of Europe	Ordovician of the Baltic				Devonian of France	Ordovician of Ibero-Bohemia
Devonian	Late Devonian	Famennian						Famennian					358.9
	Late Devonian	Frasnian						Frasnian					372.2
	Middle Devonian	Givetian						Givetian					382.7
	Middle Devonian	Eifelian						Couvinien					387.7
	Early Devonian	Emsian											393.3
		Pragian											407.6
		Pragian						Coblencien					408.2 *
		Lochkovian						Gedinnine					410.8
Silurian	Pridoli												419.2
	Ludlow	Ludfordian											423
	Ludlow	Gorstian											425.6
	Wenlock	Homerian	Gleedonian										427.4
		Homerian	Whitwellian										429.7 *
		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