PBDB Timescale

Cambrian Epochs

The interval definitions in this timescale are derived from the following sources:

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
M. Kretzoi. 1942. Necroteuthis n. g. (Ceph. Dibr., Necroteuthidae N. F.) aus dem Oligozän von Budapest und das system der Dibranchiata. Földtani Közlöny 72:125-238 view

There are 12 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 594 collections

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International Chronostratigraphic Timescale			Cambrian Epochs	Cambrian of North America		Cambrian of Kazakhstan	Cambrian of China		Ordovician of North America
Ordovician	Late Ordovician	Hirnantian							Cincinnatian	Gamachian				443.8
		Katian								Gamachian				445.2
										Richmondian				446 *
										Maysvillian	Rocklandian †/Shermanian/Ashbyan/Kirkfieldian/Blackriveran/Wildernessian/Trentonian/Franklinian			449.8 *
										Edenian				450.4 *
									Mohawkian	Chatfieldian				451.1 *
		Sandbian								Chatfieldian				453
										Turinian				453.7 *
									Whiterockian		Canadian †	Chazyan †/Marmor		457 *
	Middle Ordovician	Darriwilian												458.4
		Dapingian												467.3
		Dapingian								Rangerian				469.1 *
	Early Ordovician	Floian							Ibexian	Blackhillsian		Jeffersonian †	Cassinian †	470
		Floian								Tulean				473.9 *
		Tremadocian				Ungurian				Tulean				477.7
										Stairsian				480.3 *
										Skullrockian			Demingian †	482 *
Cambrian	Furongian	Stage 10	Late Cambrian		Franconian †/Dresbachian/Millardan	Batyrbaian	Niuchehean	Taoyuanian †		Skullrockian				485.4
		Stage 10		Sunwaptan			Niuchehean							487.5
		Jiangshanian					Jiangshanian							489.5
						Aksaian								490.7 *
						Sakian								492.2 *
				Steptoean										493 *
		Paibian					Paibian							494
		Paibian					Paibian	Waergangian †/Youshuanian						494.9 *
	Miaolingian	Guzhangian	Middle Cambrian	Marjumian	Albertian †	Ayusokkanian	Guzhangian	Wangcunian †						497
		Guzhangian					Guzhangian							499.5
		Drumian				Zhanaarykian	Drumian							500.5
		Drumian				Tuesaian	Drumian							503
		Wuliuan		Topazan		Tuesaian	Wuliuan/Taijangian							504.5
				Topazan										505.3
				Delamaran										506.5
	Series 2	Stage 4	Early Cambrian		Waucoban †		Duyunian							509
						Toyonian								510 *
				Dyeran		Toyonian								511 *
						Botomian								512.5 *
		Stage 3					Nangaoian							514
				Montezuman										514.8 *
				Montezuman		Atdabanian								515.6 *
				Begadean		Atdabanian								519.9 *
	Terreneuvian	Stage 2				Tommotian	Meishucunian							521
		Stage 2												525.5
		Fortunian												529
		Fortunian					Jinnigian							530.7
														538.8