PBDB Timescale

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

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 126764 collections

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International Chronostratigraphic Timescale			Ordovician of Australia	Ordovician of the Baltic				Silurian of the Baltic
Silurian	Pridoli							Ohesaare	419.2
	Pridoli							Kaugetuma	421.7 *
	Ludlow	Ludfordian						Kuressaare	423
		Ludfordian						Paadla	423.4 *
		Gorstian						Paadla	425.6
	Wenlock	Homerian						Rootsikula	427.4
		Homerian						Jaagarahu	429.2 *
		Sheinwoodian						Jaagarahu	430.5
		Sheinwoodian						Jaani	431.8 *
	Llandovery	Telychian						Jaani	433.4
		Telychian						Adavere	434 *
		Aeronian						Adavere	438.5
		Aeronian						Raikkula	439.4 *
		Rhuddanian						Raikkula	440.8
		Rhuddanian						Juuru	441.4 *
Ordovician	Late Ordovician	Hirnantian	Bolindian	Harju	Porkuni				443.8
		Katian	Bolindian		Pirgu				445.2
			Eastonian		Pirgu				449 *
					Vormsi				449.6 *
					Nabala	Johvi †			450 *
				Viru	Rakvere				450.6 *
			Gisbornian		Oandu				452 *
		Sandbian			Keila	Idavere †			453
					Haljala				453.9
					Kukruse				456.4 *
					Uhaku	Aluoja †			457.5 *
	Middle Ordovician	Darriwilian	Darriwilian		Uhaku				458.4
					Lasnamagi				458.9 *
					Aseri				460.4 *
				Oeland	Kunda				462.9 *
					Kunda	Valaste †/Hunderum			464.3 *
					Volkhov		Langevoja †/Vaana/Saka		467.1 *
		Dapingian	Yapeenian						467.3
			Castlemainian						468.5 *
			Castlemainian		Billingen				469.3 *
	Early Ordovician	Floian	Chewtonian						470
			Chewtonian			Latorp †			470.1 *
			Bendigonian						471.8 *
			Lancefieldian						473.5 *
					Hunneberg				473.7 *
		Tremadocian			Hunneberg				477.7
					Varangu				481.3 *
					Pakerort				482.2 *
			Warendian						482.8 *
Cambrian	Furongian	Stage 10							485.4
Cambrian	Furongian	Stage 10							486.3 *
									486.5