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
M. O. Woodburne. 1987. A prospectus of the North American Mammal Ages. In: Woodburne, M. O. (ed.), Cenozoic Mammals of North America. University of California Press, Berkelery, CA 285-290 view
J. Alroy. 2000. New methods for quantifying macroevolutionary patterns and processes. Paleobiology 26(4):707-733 view
F. M. Gradstein, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 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 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		Pakerort			482.8 *
								485.4 *
								486.3
								486.5