PBDB Interval

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
F. M. Gradstein, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 view
D. H. Erwin and S. A. Bowring. 2004. Cambrian time scale. 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 126689 collections

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International Chronostratigraphic Timescale			Ordovician of the Baltic				Cambrian of Siberia	Ten Million Year Bins	Ordovician of Ibero-Bohemia
Ordovician	Late Ordovician	Hirnantian	Harju	Porkuni				Ordovician 5	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 †			Ordovician 4					453
				Haljala									453.9
				Haljala							Zahorany †/Vinice	Letna †	456.2 *
				Kukruse									456.4 *
				Uhaku	Aluoja †								457.5 *
										Liben †			458 *
	Middle Ordovician	Darriwilian						Ordovician 3					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						Ordovician 2		Klabava †			467.3
									Arenigian				468
				Billingen									469.3 *
	Early Ordovician	Floian											470
					Latorp †								470.1 *
				Hunneberg									473.7 *
		Tremadocian		Hunneberg				Ordovician 1	Tremadocian				477.7
				Varangu									481.3 *
				Pakerort									482.2 *
				Pakerort			Mansian †						483.55 *
													485.4 *
													486.3
													486.5