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
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, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 view
F. M. Gradstein, J. G. Ogg, M. D. Schmitz and G. M. Ogg. 2020. Geologic Time Scale 2020 view
D. H. Erwin and S. A. Bowring. 2004. Cambrian time scale. 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 126734 collections

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International Chronostratigraphic Timescale			Ten Million Year Bins	Cambrian of Siberia			Cambrian of West Avalonia
Cambrian	Furongian	Stage 10	Cambrian 5	Batyrbaian	Tavgian †	Ketyan †/Yurakian		485.4
		Jiangshanian		Batyrbaian				489.5
				Aksaian				490.7 *
				Sakian				492.2 *
		Paibian						494
		Paibian				Ensyan †/Maduan/Nganasanian		494.7 *
	Miaolingian	Guzhangian	Cambrian 4	Ayusokkanian				497
				Ayusokkanian			Arcadian	498.4
				Mayan/Menevian				499.5
		Drumian		Mayan/Menevian				500.5
		Wuliuan	Cambrian 3	Amgan/Solvan				504.5
	Series 2	Stage 4		Amgan/Solvan			Branchian	509
				Toyonian	Lenian †			510 *
				Botomian				512.5 *
		Stage 3	Cambrian 2	Botomian				514
				Atdabanian				515.6 *
				Atdabanian			Placentian	517.1
	Terreneuvian	Stage 2		Tommotian				521
		Stage 2		Nemakit-Daldynian				525.5
		Fortunian	Cambrian 1	Nemakit-Daldynian	Manykaian †			529
								538.8