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, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 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
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 126848 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