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
A. G. Sennikov and V. K. Golubev. 2006. Vyazniki Biotic Assemblage of the Terminal Permian. Paleontological Journal 40(suppl. 4):S475-S481 view
M. Freudenthal. 2006. Mammal Paleogene zones. personal communication 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 126700 collections

Show more time

Show linear time

International Chronostratigraphic Timescale			Ordovician of the Baltic				Ten Million Year Bins	Ordovician of Ibero-Bohemia
Ordovician	Late Ordovician	Hirnantian	Harju	Porkuni			Ordovician 5	Kosovian				443.8
		Katian		Pirgu				Kralodvorian	Bohdalec †			445.2
				Vormsi				Kralodvorian				449.6 *
				Vormsi				Berounian				449.7 *
				Nabala	Johvi †							450 *
			Viru	Rakvere								450.6 *
				Oandu								452 *
		Sandbian		Keila	Idavere †		Ordovician 4					453
				Haljala								453.9
				Haljala						Zahorany †/Vinice	Letna †	456.2 *
				Kukruse								456.4 *
				Uhaku	Aluoja †							457.5 *
									Liben †			458 *
	Middle Ordovician	Darriwilian					Ordovician 3					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					Ordovician 2		Klabava †			467.3
								Arenigian				468
				Billingen								469.3 *
	Early Ordovician	Floian										470
					Latorp †							470.1 *
				Hunneberg								473.7 *
		Tremadocian		Hunneberg			Ordovician 1	Tremadocian				477.7
				Varangu								481.3 *
				Pakerort								482.2 *
												485.4 *
												486.3
												486.5