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
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

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 126689 collections

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