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
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
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

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 126778 collections

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International Chronostratigraphic Timescale			Cambrian of Britain		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	Merioneth	Dolgellian/Trempealeauan			Pakerort				485.4
											486.3 *
											486.5
				Festiniogian							489.2 *
		Jiangshanian		Festiniogian							489.5
		Jiangshanian		Maentwrogian							493.1 *
		Paibian		Maentwrogian							494
	Miaolingian	Guzhangian	St Davids								497
		Drumian									500.5
		Wuliuan									504.5
	Series 2	Stage 4	Caerfai								509
	Series 2	Stage 3									514
	Terreneuvian	Stage 2									521
	Terreneuvian	Fortunian									529
											538.8