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
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
Z.-X. Qiu and Z.-D. Qiu. 1995. Chronological sequence and subdivision of Chinese Neogene mammalian faunas. Palaeogeography, Palaeoclimatology, Palaeoecology 116(1-2):41-70 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			Ten Million Year Bins	Ordovician of the Baltic				Ordovician of China			Ordovician of Ibero-Bohemia
Ordovician	Late Ordovician	Hirnantian	Ordovician 5	Harju	Porkuni			Hirnantian	Xiaoxita †/Shikou	Wufeng †	Kosovian				443.8
		Katian			Pirgu			Chientangkiangian		Wufeng †	Kralodvorian	Bohdalec †			445.2
					Pirgu			Neichianshanian/Hanjiang							449.5
					Vormsi										449.6 *
					Vormsi						Berounian				449.7 *
					Nabala	Johvi †									450 *
				Viru	Rakvere										450.6 *
					Oandu										452 *
		Sandbian	Ordovician 4		Keila	Idavere †									453
					Haljala										453.9
					Haljala								Zahorany †/Vinice	Letna †	456.2 *
					Kukruse										456.4 *
					Uhaku	Aluoja †									457.5 *
												Liben †			458 *
	Middle Ordovician	Darriwilian	Ordovician 3					Darriwilian	Guniu †/Hulo						458.4
											Dobrotivian				458.5 *
					Lasnamagi						Dobrotivian				458.9 *
					Lasnamagi						Oretanian				459.7 *
					Aseri										460.4 *
					Aseri							Sarka †			461.7 *
				Oeland	Kunda										462.9 *
						Valaste †/Hunderum									464.3 *
									Hunjiang †	Dawan †/Daobaowan/Ningkuo					466.3 *
					Volkhov		Langevoja †/Vaana/Saka								467.1 *
		Dapingian	Ordovician 2					Dapingian				Klabava †			467.3
											Arenigian				468
					Billingen										469.3 *
	Early Ordovician	Floian						Yiyangian							470
						Latorp †									470.1 *
					Hunneberg										473.7 *
		Tremadocian	Ordovician 1					Xinchangian			Tremadocian				477.7
										Lianghekou †					477.9 *
					Varangu										481.3 *
					Pakerort										482.2 *
															485.4 *
															486.3
															486.5