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

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 126778 collections

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International Chronostratigraphic Timescale			Ordovician of Britain				Ordovician of Australia	Ordovician of the Baltic
Ordovician	Late Ordovician	Hirnantian	Ashgill	Hirnantian			Bolindian	Harju	Porkuni			443.8
		Katian		Rawtheyan					Pirgu			445.2
				Cautleyan								448.9 *
				Cautleyan			Eastonian					449 *
				Pusgillian								449.3 *
			Caradoc	Streffordian	Onnian †				Vormsi			449.6 *
									Nabala	Johvi †		450 *
								Viru	Rakvere			450.6 *
				Cheneyan					Rakvere			451.5 *
				Cheneyan			Gisbornian		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 *
									Kukruse			456.4 *
				Aurelucian								456.8 *
					Soudleyan †/Harnagian/Costonian							457.4 *
					Soudleyan †/Harnagian/Costonian				Uhaku	Aluoja †		457.5 *
	Middle Ordovician	Darriwilian	Llanvirn	Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn			Darriwilian		Uhaku			458.4
									Lasnamagi			458.9 *
									Aseri			460.4 *
				Abereiddian/Early Llanvirn					Aseri			461.3 *
								Oeland	Kunda			462.9 *
									Kunda	Valaste †/Hunderum		464.3 *
									Volkhov		Langevoja †/Vaana/Saka	467.1 *
		Dapingian					Yapeenian					467.3
			Arenig	Fennian			Yapeenian					468.4 *
							Castlemainian					468.5 *
							Castlemainian		Billingen			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