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, 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			Ten Million Year Bins	Cambrian of Britain		Cambrian of Kazakhstan	Cambrian of Australia
Cambrian	Furongian	Stage 10	Cambrian 5	Merioneth	Dolgellian/Trempealeauan	Batyrbaian	Datsonian	485.4
					Dolgellian/Trempealeauan		Payntonian	486.8 *
					Festiniogian		Payntonian	489.2 *
		Jiangshanian					Iverian	489.5
						Aksaian		490.7 *
						Sakian		492.2 *
					Maentwrogian			493.1 *
		Paibian			Maentwrogian		Idamean	494
	Miaolingian	Guzhangian	Cambrian 4	St Davids		Ayusokkanian	Mindyallan	497
						Ayusokkanian	Boomerangian	499
							Boomerangian	499.5
		Drumian				Zhanaarykian	Undillan	500.5
		Drumian				Tuesaian	Floran	503
		Wuliuan	Cambrian 3			Tuesaian	Templetonian	504.5
							Templetonian	505.3
							Ordian	507.8 *
	Series 2	Stage 4		Caerfai				509
						Toyonian		510 *
						Toyonian		510.8 *
						Botomian		512.5 *
		Stage 3	Cambrian 2			Botomian		514
		Stage 3				Atdabanian		515.6 *
	Terreneuvian	Stage 2				Tommotian		521
		Stage 2						525.5
		Fortunian	Cambrian 1					529
								538.8