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
Z.-X. Qiu and Z.-D. Qiu. 1995. Chronological sequence and subdivision of Chinese Neogene mammalian faunas. Palaeogeography, Palaeoclimatology, Palaeoecology 116(1-2):41-70 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. 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 126778 collections

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International Chronostratigraphic Timescale			Ordovician of Ibero-Bohemia				Ordovician of Australia	Ordovician of the Baltic
Ordovician	Late Ordovician	Hirnantian	Kosovian				Bolindian	Harju	Porkuni			443.8
		Katian	Kralodvorian	Bohdalec †			Bolindian		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		Klabava †			Yapeenian					467.3
			Arenigian				Yapeenian					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