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
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 126884 collections

Show more time

Show linear time

International Chronostratigraphic Timescale			Ordovician of Britain				Cambrian of Kazakhstan	Ordovician of the Baltic
Ordovician	Late Ordovician	Hirnantian	Ashgill	Hirnantian				Harju	Porkuni			443.8
		Katian		Rawtheyan					Pirgu			445.2
				Cautleyan								448.9 *
				Pusgillian								449.3 *
			Caradoc	Streffordian	Onnian †				Vormsi			449.6 *
									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 *
									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					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										467.3
			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	Tremadoc	Migneintian			Ungurian					477.7
				Cressagian								480.8 *
									Varangu			481.3 *
									Pakerort			482.2 *
									Pakerort			485 *
												485.4 *
												486.3
												486.5