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
B. D. Webby. 1998. Steps toward a global standard for Ordovician stratigraphy. Newsletters in Stratigraphy 36:1-33 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
A. G. Sennikov and V. K. Golubev. 2006. Vyazniki Biotic Assemblage of the Terminal Permian. Paleontological Journal 40(suppl. 4):S475-S481 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 China			Ordovician of the Baltic				Cambrian of Kazakhstan	Ordovician of Britain
Ordovician	Late Ordovician	Hirnantian	Hirnantian	Xiaoxita †/Shikou	Wufeng †	Harju	Porkuni				Ashgill	Hirnantian			443.8
		Katian	Chientangkiangian				Pirgu					Rawtheyan			445.2
												Cautleyan			448.9 *
												Pusgillian			449.3 *
			Neichianshanian/Hanjiang									Pusgillian			449.5
							Vormsi				Caradoc	Streffordian	Onnian †		449.6 *
							Nabala	Johvi †							450 *
						Viru	Rakvere								450.6 *
							Rakvere					Cheneyan			451.5 *
							Oandu					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	Darriwilian	Guniu †/Hulo			Uhaku				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 *
								Valaste †/Hunderum							464.3 *
				Hunjiang †	Dawan †/Daobaowan/Ningkuo										466.3 *
							Volkhov		Langevoja †/Vaana/Saka						467.1 *
		Dapingian	Dapingian												467.3
											Arenig	Fennian			468.4 *
							Billingen								469.3 *
	Early Ordovician	Floian	Yiyangian												470
								Latorp †							470.1 *
												Whitlandian			471.1 *
							Hunneberg					Whitlandian			473.7 *
												Moridunian			474.3 *
		Tremadocian	Xinchangian							Ungurian	Tremadoc	Migneintian			477.7
					Lianghekou †							Migneintian			477.9 *
												Cressagian			480.8 *
							Varangu								481.3 *
							Pakerort								482.2 *
							Pakerort								485 *
															485.4 *
															486.3
															486.5