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
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 126701 collections

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International Chronostratigraphic Timescale			Ordovician of North America					Ordovician of Australia	Cambrian of Kazakhstan	Ordovician of the Baltic
Ordovician	Late Ordovician	Hirnantian	Cincinnatian	Gamachian				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									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						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 *
				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					Ungurian					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