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
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 126520 collections

Show more time

Show linear time

International Chronostratigraphic Timescale			Cambrian Epochs	Cambrian of Kazakhstan	Obsolete Names for ICS Units		Cambrian of West Avalonia
Cambrian	Furongian	Stage 10	Late Cambrian	Batyrbaian				485.4
		Jiangshanian		Batyrbaian				489.5
				Aksaian				490.7 *
				Sakian				492.2 *
		Paibian		Sakian				494
	Miaolingian	Guzhangian	Middle Cambrian	Ayusokkanian	Series 3 †			497
				Ayusokkanian			Arcadian	498.4
								499.5
		Drumian		Zhanaarykian				500.5
		Drumian		Tuesaian				503
		Wuliuan		Tuesaian		Stage 5 †		504.5
		Wuliuan				Stage 5 †		505.3
	Series 2	Stage 4	Early Cambrian				Branchian	509
				Toyonian				510 *
				Botomian				512.5 *
		Stage 3		Botomian				514
				Atdabanian				515.6 *
				Atdabanian			Placentian	517.1
	Terreneuvian	Stage 2		Tommotian				521
		Stage 2						525.5
		Fortunian						529
								538.8