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
F. M. Gradstein, F. P. Agterberg, J. G. Ogg, J. Hardenbol, P. Van Veen, J. Thierry, and Z. Huang. 1995. A Triassic, Jurassic, and Cretaceous time scale. SEPM Special Publication 54 view
J. Palfy, P. L. Smith, and J. K. Mortensen. 2000. A U-Pb and 40Ar/39Ar time scale for the Jurassic. Canadian Journal of Earth Sciences 37(6):923-944 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
D. H. Erwin and S. A. Bowring. 2004. Cambrian time scale. 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 126762 collections

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International Chronostratigraphic Timescale			Cambrian of Siberia	Ordovician of Australia	Ordovician of the Baltic
Ordovician	Late Ordovician	Hirnantian		Bolindian	Harju	Porkuni			443.8
		Katian		Bolindian		Pirgu			445.2
				Eastonian		Pirgu			449 *
						Vormsi			449.6 *
						Nabala	Johvi †		450 *
					Viru	Rakvere			450.6 *
				Gisbornian		Oandu			452 *
		Sandbian				Keila	Idavere †		453
						Haljala			453.9
						Kukruse			456.4 *
						Uhaku	Aluoja †		457.5 *
	Middle Ordovician	Darriwilian		Darriwilian		Uhaku			458.4
						Lasnamagi			458.9 *
						Aseri			460.4 *
					Oeland	Kunda			462.9 *
						Kunda	Valaste †/Hunderum		464.3 *
						Volkhov		Langevoja †/Vaana/Saka	467.1 *
		Dapingian		Yapeenian					467.3
				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				Hunneberg			477.7
						Varangu			481.3 *
						Pakerort			482.2 *
				Warendian					482.8 *
			Mansian †	Warendian					483.55 *
									485.4 *
									486.3
									486.5