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
M. Harzhauser and W. E. Piller. 2004. Integrated stratigraphy of the Sarmatian (Upper Middle Miocene) in the western Central Paratethys. Stratigraphy 1(1):65-86 view
Z.-X. Qiu and Z.-D. Qiu. 1995. Chronological sequence and subdivision of Chinese Neogene mammalian faunas. Palaeogeography, Palaeoclimatology, Palaeoecology 116(1-2):41-70 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

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International Chronostratigraphic Timescale			Ordovician of the Baltic				Ordovician of Australia	Ordovician of Ibero-Bohemia				Ordovician of Britain
Ordovician	Late Ordovician	Hirnantian	Harju	Porkuni			Bolindian	Kosovian				Ashgill	Hirnantian			443.8
		Katian		Pirgu				Kralodvorian	Bohdalec †				Rawtheyan			445.2
													Cautleyan			448.9 *
							Eastonian						Cautleyan			449 *
													Pusgillian			449.3 *
				Vormsi								Caradoc	Streffordian	Onnian †		449.6 *
				Vormsi				Berounian								449.7 *
				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 *
										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					Darriwilian					Llanvirn	Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn			458.4
								Dobrotivian								458.5 *
				Lasnamagi				Dobrotivian								458.9 *
				Lasnamagi				Oretanian								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					Yapeenian		Klabava †							467.3
								Arenigian								468
												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						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