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
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 126149 collections

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International Chronostratigraphic Timescale			Ten Million Year Bins	Cambrian of Australia	Cambrian of North America		Cambrian of Britain		Cambrian of Siberia
Cambrian	Furongian	Stage 10	Cambrian 5	Datsonian		Franconian †/Dresbachian/Millardan	Merioneth	Dolgellian/Trempealeauan	Batyrbaian	Tavgian †	Ketyan †/Yurakian	485.4
				Payntonian								486.8 *
					Sunwaptan							487.5
								Festiniogian				489.2 *
		Jiangshanian		Iverian								489.5
									Aksaian			490.7 *
									Sakian			492.2 *
					Steptoean							493 *
								Maentwrogian				493.1 *
		Paibian		Idamean								494
		Paibian		Idamean							Ensyan †/Maduan/Nganasanian	494.7 *
	Miaolingian	Guzhangian	Cambrian 4	Mindyallan	Marjumian	Albertian †	St Davids		Ayusokkanian			497
				Boomerangian					Ayusokkanian			499
				Boomerangian					Mayan/Menevian			499.5
		Drumian		Undillan								500.5
		Drumian		Floran								503
		Wuliuan	Cambrian 3	Templetonian	Topazan				Amgan/Solvan			504.5
				Templetonian	Delamaran							506.5
				Ordian								507.8 *
	Series 2	Stage 4				Waucoban †	Caerfai					509
									Toyonian	Lenian †		510 *
												510.8 *
					Dyeran							511 *
									Botomian			512.5 *
		Stage 3	Cambrian 2									514
					Montezuman							514.8 *
					Montezuman				Atdabanian			515.6 *
					Begadean				Atdabanian			519.9 *
	Terreneuvian	Stage 2							Tommotian			521
		Stage 2							Nemakit-Daldynian			525.5
		Fortunian	Cambrian 1						Nemakit-Daldynian	Manykaian †		529
												538.8