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, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 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

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.

This timescale is used in the definition of 126679 collections

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International Chronostratigraphic Timescale			Devonian of Eastern North America		Devonian Subages	Devonian of France
Devonian	Late Devonian	Famennian	Conewangan/Conneautan/Canadaway		Late Famennian	Famennian	358.9
					Middle Famennian		365.3 *
					Early Famennian		368.5 *
		Frasnian	West Fallsian/Sonyean		Late Frasnian	Frasnian	372.2
					Middle Frasnian		375.4 *
					Early Frasnian		379.3 *
	Middle Devonian	Givetian	Geneseean/Taghanican/Tioughniogan	Cazenovian	Late Givetian	Givetian	382.7
					Middle Givetian		383.7 *
					Early Givetian		385.9 *
		Eifelian	Southwoodian		Late Eifelian	Couvinien	387.7
		Eifelian	Southwoodian		Early Eifelian		390.3 *
	Early Devonian	Emsian	Sawkillian/Deer Parkian	Helderbergian	Late Emsian		393.3
		Emsian	Sawkillian/Deer Parkian		Early Emsian		398.3 *
		Pragian			Pragian		407.6
		Pragian			Pragian	Coblencien	408.2 *
		Lochkovian			Late Lochkovian	Gedinnine	410.8
					Middle Lochkovian		412.8 *
					Early Lochkovian		415.6 *
							419.2