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 126762 collections

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International Chronostratigraphic Timescale			Devonian Subages	Ordovician of the Baltic				Devonian of Germany
Devonian	Late Devonian	Famennian	Late Famennian					Wocklum/Dasberg/Hemberg/Nehden	358.9
			Middle Famennian						365.3 *
			Early Famennian						368.5 *
		Frasnian	Late Frasnian					Adorf	372.2
			Middle Frasnian						375.4 *
			Early Frasnian						379.3 *
	Middle Devonian	Givetian	Late Givetian					Givetian	382.7
			Middle Givetian						383.7 *
			Early Givetian						385.9 *
		Eifelian	Late Eifelian					Eifelian	387.7
		Eifelian	Early Eifelian					Eifelian	390.3 *
	Early Devonian	Emsian	Late Emsian					Emsian	393.3
		Emsian	Early Emsian					Emsian	398.3 *
		Pragian	Pragian					Siegen	407.6
		Lochkovian	Late Lochkovian					Gedinnine	410.8
			Middle Lochkovian						412.8 *
			Early Lochkovian						415.6 *
Silurian	Pridoli								419.2
	Ludlow	Ludfordian							423
	Ludlow	Gorstian							425.6
	Wenlock	Homerian							427.4
	Wenlock	Sheinwoodian							430.5
	Llandovery	Telychian							433.4
		Aeronian							438.5
		Rhuddanian							440.8
Ordovician	Late Ordovician	Hirnantian		Harju	Porkuni				443.8
		Katian			Pirgu				445.2
					Vormsi				449.6 *
					Nabala	Johvi †			450 *
				Viru	Rakvere				450.6 *
					Oandu				452 *
		Sandbian			Keila	Idavere †			453
					Haljala				453.9
					Kukruse				456.4 *
					Uhaku	Aluoja †			457.5 *
	Middle Ordovician	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			Volkhov				467.3
		Dapingian			Billingen				469.3 *
	Early Ordovician	Floian							470
						Latorp †			470.1 *
					Hunneberg				473.7 *
		Tremadocian			Hunneberg				477.7
					Varangu				481.3 *
					Pakerort				482.2 *
Cambrian	Furongian	Stage 10			Pakerort				485.4
Cambrian	Furongian	Stage 10							486.3 *
									486.5