PBDB Timescale

Cambrian of North America

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

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
F. M. Gradstein, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 view
B. D. Webby. 1998. Steps toward a global standard for Ordovician stratigraphy. Newsletters in Stratigraphy 36:1-33 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 1827 collections

Show more time

Show linear time

International Chronostratigraphic Timescale			Cambrian of North America		Cambrian of Kazakhstan	Ordovician of the Baltic				Cambrian of China
Ordovician	Late Ordovician	Hirnantian				Harju	Porkuni					443.8
		Katian					Pirgu					445.2
							Vormsi					449.6 *
							Nabala	Johvi †				450 *
						Viru	Rakvere					450.6 *
							Oandu					452 *
		Sandbian					Keila	Idavere †				453
							Haljala					453.9
							Kukruse					456.4 *
							Uhaku	Aluoja †				457.5 *
	Middle Ordovician	Darriwilian					Uhaku					458.4
							Lasnamagi					458.9 *
							Aseri					460.4 *
						Oeland	Kunda					462.9 *
							Kunda	Valaste †/Hunderum				464.3 *
							Volkhov		Langevoja †/Vaana/Saka			467.1 *
		Dapingian					Volkhov					467.3
		Dapingian					Billingen					469.3 *
	Early Ordovician	Floian										470
								Latorp †				470.1 *
							Hunneberg					473.7 *
		Tremadocian			Ungurian		Hunneberg					477.7
							Varangu					481.3 *
							Pakerort					482.2 *
Cambrian	Furongian	Stage 10		Franconian †/Dresbachian/Millardan	Batyrbaian		Pakerort			Niuchehean	Taoyuanian †	485.4
												486.3 *
												486.5
			Sunwaptan									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	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		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