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, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 view
F. M. Gradstein, J. G. Ogg, M. D. Schmitz and G. M. Ogg. 2020. Geologic Time Scale 2020 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
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
M. O. Woodburne. 1987. A prospectus of the North American Mammal Ages. In: Woodburne, M. O. (ed.), Cenozoic Mammals of North America. University of California Press, Berkelery, CA 285-290 view
J. Alroy. 2000. New methods for quantifying macroevolutionary patterns and processes. Paleobiology 26(4):707-733 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 126973 collections

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International Chronostratigraphic Timescale			Ordovician of Ibero-Bohemia				Ordovician of Britain				Ordovician of the Baltic
Ordovician	Late Ordovician	Hirnantian	Kosovian				Ashgill	Hirnantian			Harju	Porkuni			443.8
		Katian	Kralodvorian	Bohdalec †				Rawtheyan				Pirgu			445.2
								Cautleyan							448.9 *
								Pusgillian							449.3 *
							Caradoc	Streffordian	Onnian †			Vormsi			449.6 *
			Berounian									Vormsi			449.7 *
												Nabala	Johvi †		450 *
											Viru	Rakvere			450.6 *
								Cheneyan				Rakvere			451.5 *
								Cheneyan				Oandu			452 *
								Burrellian				Oandu			452.7 *
		Sandbian										Keila	Idavere †		453
									Actonian †			Keila			453.2 *
									Actonian †			Haljala			453.9
									Marshbrookian †	Woolstonian †					454.2 *
									Longvillian †						455.2 *
					Zahorany †/Vinice	Letna †									456.2 *
												Kukruse			456.4 *
								Aurelucian							456.8 *
									Soudleyan †/Harnagian/Costonian						457.4 *
												Uhaku	Aluoja †		457.5 *
				Liben †											458 *
	Middle Ordovician	Darriwilian					Llanvirn	Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn							458.4
			Dobrotivian												458.5 *
			Dobrotivian									Lasnamagi			458.9 *
			Oretanian									Lasnamagi			459.7 *
												Aseri			460.4 *
								Abereiddian/Early Llanvirn							461.3 *
				Sarka †											461.7 *
											Oeland	Kunda			462.9 *
												Kunda	Valaste †/Hunderum		464.3 *
												Volkhov		Langevoja †/Vaana/Saka	467.1 *
		Dapingian		Klabava †											467.3
			Arenigian												468
							Arenig	Fennian							468.4 *
												Billingen			469.3 *
	Early Ordovician	Floian													470
													Latorp †		470.1 *
								Whitlandian							471.1 *
								Whitlandian				Hunneberg			473.7 *
								Moridunian							474.3 *
		Tremadocian	Tremadocian				Tremadoc	Migneintian							477.7
								Cressagian							480.8 *
												Varangu			481.3 *
												Pakerort			482.2 *
												Pakerort			485 *
															485.4 *
															486.3
															486.5