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
F. F. Steininger, W. A. Berggren, D. V. Kent, R. L. Bernor, S. Sen and J. Agusti. 1996. Circum-Mediterranean Neogene (Miocene and Pliocene) marine-continental chronologic correlations of European mammal units. The Evolution of Western Eurasian Neogene Mammal Faunas (eds. R. L. Bernor, V. Fahlbusch, and H.-W. Mittmann) view
F. M. Gradstein, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 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 126973 collections

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International Chronostratigraphic Timescale			Ordovician of Australia	Ordovician of Ibero-Bohemia				Ordovician of the Baltic
Ordovician	Late Ordovician	Hirnantian	Bolindian	Kosovian				Harju	Porkuni			443.8
		Katian	Bolindian	Kralodvorian	Bohdalec †				Pirgu			445.2
			Eastonian						Pirgu			449 *
									Vormsi			449.6 *
				Berounian					Vormsi			449.7 *
									Nabala	Johvi †		450 *
								Viru	Rakvere			450.6 *
			Gisbornian						Oandu			452 *
		Sandbian							Keila	Idavere †		453
									Haljala			453.9
						Zahorany †/Vinice	Letna †		Haljala			456.2 *
									Kukruse			456.4 *
									Uhaku	Aluoja †		457.5 *
					Liben †							458 *
	Middle Ordovician	Darriwilian	Darriwilian									458.4
				Dobrotivian								458.5 *
				Dobrotivian					Lasnamagi			458.9 *
				Oretanian					Lasnamagi			459.7 *
									Aseri			460.4 *
					Sarka †				Aseri			461.7 *
								Oeland	Kunda			462.9 *
									Kunda	Valaste †/Hunderum		464.3 *
									Volkhov		Langevoja †/Vaana/Saka	467.1 *
		Dapingian	Yapeenian		Klabava †							467.3
			Yapeenian	Arenigian								468
			Castlemainian									468.5 *
			Castlemainian						Billingen			469.3 *
	Early Ordovician	Floian	Chewtonian									470
			Chewtonian							Latorp †		470.1 *
			Bendigonian									471.8 *
			Lancefieldian									473.5 *
									Hunneberg			473.7 *
		Tremadocian		Tremadocian					Hunneberg			477.7
									Varangu			481.3 *
									Pakerort			482.2 *
			Warendian						Pakerort			482.8 *
												485.4 *
												486.3
												486.5