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
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			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										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