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
J. Meng and M. C. McKenna. 1998. Faunal turnovers of Paleogene mammals from the Mongolian Plateau. Nature 394:364-367 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
F. M. Gradstein, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 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 126585 collections

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International Chronostratigraphic Timescale			Ordovician of Australia	Ordovician of the Baltic				Cambrian of Kazakhstan	Ordovician of Ibero-Bohemia
Ordovician	Late Ordovician	Hirnantian	Bolindian	Harju	Porkuni				Kosovian				443.8
		Katian	Bolindian		Pirgu				Kralodvorian	Bohdalec †			445.2
			Eastonian		Pirgu								449 *
					Vormsi								449.6 *
					Vormsi				Berounian				449.7 *
					Nabala	Johvi †							450 *
				Viru	Rakvere								450.6 *
			Gisbornian		Oandu								452 *
		Sandbian			Keila	Idavere †							453
					Haljala								453.9
					Haljala						Zahorany †/Vinice	Letna †	456.2 *
					Kukruse								456.4 *
					Uhaku	Aluoja †							457.5 *
										Liben †			458 *
	Middle Ordovician	Darriwilian	Darriwilian										458.4
									Dobrotivian				458.5 *
					Lasnamagi				Dobrotivian				458.9 *
					Lasnamagi				Oretanian				459.7 *
					Aseri								460.4 *
					Aseri					Sarka †			461.7 *
				Oeland	Kunda								462.9 *
					Kunda	Valaste †/Hunderum							464.3 *
					Volkhov		Langevoja †/Vaana/Saka						467.1 *
		Dapingian	Yapeenian							Klabava †			467.3
			Yapeenian						Arenigian				468
			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			Ungurian	Tremadocian				477.7
					Varangu								481.3 *
					Pakerort								482.2 *
			Warendian		Pakerort								482.8 *
													485.4 *
													486.3
													486.5