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. F. Steininger, W. A. Berggren, D. V. Kent, R. L. Bernor, S. Sen and J. Agusti. 1996. Circum-Mediterranean Neogene (Miocene and Pliocene) marine-continental chronologic correlations of European mammal units. The Evolution of Western Eurasian Neogene Mammal Faunas (eds. R. L. Bernor, V. Fahlbusch, and H.-W. Mittmann) view
A. D. Barnosky, M. Holmes, R. Kirchholtes, E. Lindsey, K.C. Maguire, A.W. Poust, M.A. Stegner, J. Sunseri, B. Swartz, J. Swift, N.A. Villavicencio and G. Wogan. 2014. Prelude to the Anthropocene: Two new North American Land Mammal Ages (NALMAs). The Anthropocene Review I(3):225-242 view
F. M. Gradstein, F. P. Agterberg, J. G. Ogg, J. Hardenbol, P. Van Veen, J. Thierry, and Z. Huang. 1995. A Triassic, Jurassic, and Cretaceous time scale. SEPM Special Publication 54 view
J. Palfy, P. L. Smith, and J. K. Mortensen. 2000. A U-Pb and 40Ar/39Ar time scale for the Jurassic. Canadian Journal of Earth Sciences 37(6):923-944 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 127245 collections

Show more time

Show linear time

International Chronostratigraphic Timescale			Ordovician of the Baltic				Ordovician of Australia	Ordovician of Britain
Ordovician	Late Ordovician	Hirnantian	Harju	Porkuni			Bolindian	Ashgill	Hirnantian			443.8
		Katian		Pirgu					Rawtheyan			445.2
									Cautleyan			448.9 *
							Eastonian		Cautleyan			449 *
									Pusgillian			449.3 *
				Vormsi				Caradoc	Streffordian	Onnian †		449.6 *
				Nabala	Johvi †							450 *
			Viru	Rakvere								450.6 *
				Rakvere					Cheneyan			451.5 *
				Oandu			Gisbornian		Cheneyan			452 *
				Oandu					Burrellian			452.7 *
		Sandbian		Keila	Idavere †							453
				Keila						Actonian †		453.2 *
				Haljala						Actonian †		453.9
										Marshbrookian †	Woolstonian †	454.2 *
										Longvillian †		455.2 *
				Kukruse								456.4 *
									Aurelucian			456.8 *
										Soudleyan †/Harnagian/Costonian		457.4 *
				Uhaku	Aluoja †					Soudleyan †/Harnagian/Costonian		457.5 *
	Middle Ordovician	Darriwilian		Uhaku			Darriwilian	Llanvirn	Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn			458.4
				Lasnamagi								458.9 *
				Aseri								460.4 *
				Aseri					Abereiddian/Early Llanvirn			461.3 *
			Oeland	Kunda								462.9 *
				Kunda	Valaste †/Hunderum							464.3 *
				Volkhov		Langevoja †/Vaana/Saka						467.1 *
		Dapingian					Yapeenian					467.3
							Yapeenian	Arenig	Fennian			468.4 *
							Castlemainian					468.5 *
				Billingen			Castlemainian					469.3 *
	Early Ordovician	Floian					Chewtonian					470
					Latorp †							470.1 *
									Whitlandian			471.1 *
							Bendigonian					471.8 *
							Lancefieldian					473.5 *
				Hunneberg								473.7 *
									Moridunian			474.3 *
		Tremadocian						Tremadoc	Migneintian			477.7
									Cressagian			480.8 *
				Varangu								481.3 *
				Pakerort								482.2 *
							Warendian					482.8 *
							Warendian					485 *
												485.4 *
												486.3
												486.5