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. Kretzoi. 1942. Necroteuthis n. g. (Ceph. Dibr., Necroteuthidae N. F.) aus dem Oligozän von Budapest und das system der Dibranchiata. Földtani Közlöny 72:125-238 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
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
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 North America					Ten Million Year Bins	Ordovician of Australia	Ordovician of the Baltic
Ordovician	Late Ordovician	Hirnantian	Cincinnatian	Gamachian				Ordovician 5	Bolindian	Harju	Porkuni			443.8
		Katian		Gamachian							Pirgu			445.2
				Richmondian										446 *
									Eastonian					449 *
											Vormsi			449.6 *
				Maysvillian	Rocklandian †/Shermanian/Ashbyan/Kirkfieldian/Blackriveran/Wildernessian/Trentonian/Franklinian						Vormsi			449.8 *
				Maysvillian							Nabala	Johvi †		450 *
				Edenian							Nabala			450.4 *
				Edenian						Viru	Rakvere			450.6 *
			Mohawkian	Chatfieldian							Rakvere			451.1 *
									Gisbornian		Oandu			452 *
		Sandbian						Ordovician 4			Keila	Idavere †		453
				Turinian							Keila			453.7 *
											Haljala			453.9
											Kukruse			456.4 *
			Whiterockian		Canadian †	Chazyan †/Marmor					Kukruse			457 *
											Uhaku	Aluoja †		457.5 *
	Middle Ordovician	Darriwilian						Ordovician 3	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						Ordovician 2	Yapeenian					467.3
									Castlemainian					468.5 *
				Rangerian										469.1 *
				Rangerian							Billingen			469.3 *
	Early Ordovician	Floian	Ibexian	Blackhillsian		Jeffersonian †	Cassinian †		Chewtonian					470
									Chewtonian			Latorp †		470.1 *
									Bendigonian					471.8 *
									Lancefieldian					473.5 *
											Hunneberg			473.7 *
				Tulean										473.9 *
		Tremadocian		Tulean				Ordovician 1						477.7
				Stairsian										480.3 *
				Stairsian							Varangu			481.3 *
				Skullrockian/Demingian							Varangu			482 *
											Pakerort			482.2 *
									Warendian		Pakerort			482.8 *
														485.4 *
														486.3
														486.5
														487.5