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

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International Chronostratigraphic Timescale			Cambrian of North America		Ordovician of the Baltic				Ordovician of Britain
Ordovician	Late Ordovician	Hirnantian			Harju	Porkuni			Ashgill	Hirnantian			443.8
		Katian				Pirgu				Rawtheyan			445.2
										Cautleyan			448.9 *
										Pusgillian			449.3 *
						Vormsi			Caradoc	Streffordian	Onnian †		449.6 *
						Nabala	Johvi †						450 *
					Viru	Rakvere							450.6 *
						Rakvere				Cheneyan			451.5 *
						Oandu				Cheneyan			452 *
						Oandu				Burrellian			452.7 *
		Sandbian				Keila	Idavere †						453
						Keila					Actonian †		453.2 *
						Haljala					Actonian †		453.9
											Marshbrookian †	Woolstonian †	454.2 *
											Longvillian †		455.2 *
						Kukruse							456.4 *
										Aurelucian			456.8 *
											Soudleyan †/Harnagian/Costonian		457.4 *
						Uhaku	Aluoja †				Soudleyan †/Harnagian/Costonian		457.5 *
	Middle Ordovician	Darriwilian				Uhaku			Llanvirn	Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn			458.4
						Lasnamagi							458.9 *
						Aseri							460.4 *
						Aseri				Abereiddian/Early Llanvirn			461.3 *
					Oeland	Kunda							462.9 *
						Kunda	Valaste †/Hunderum						464.3 *
						Volkhov		Langevoja †/Vaana/Saka					467.1 *
		Dapingian											467.3
									Arenig	Fennian			468.4 *
						Billingen							469.3 *
	Early Ordovician	Floian											470
							Latorp †						470.1 *
										Whitlandian			471.1 *
						Hunneberg				Whitlandian			473.7 *
										Moridunian			474.3 *
		Tremadocian							Tremadoc	Migneintian			477.7
										Cressagian			480.8 *
						Varangu							481.3 *
						Pakerort							482.2 *
													485 *
Cambrian	Furongian	Stage 10		Franconian †/Dresbachian/Millardan									485.4
													486.3 *
													486.5
			Sunwaptan										487.5
		Jiangshanian	Sunwaptan										489.5
		Jiangshanian	Steptoean										493 *
		Paibian	Steptoean										494
	Miaolingian	Guzhangian	Marjumian	Albertian †									497
		Drumian	Marjumian										500.5
		Wuliuan	Topazan										504.5
		Wuliuan	Delamaran										506.5
	Series 2	Stage 4	Delamaran	Waucoban †									509
		Stage 4	Dyeran										511 *
		Stage 3	Dyeran										514
			Montezuman										514.8 *
			Begadean										519.9 *
	Terreneuvian	Stage 2											521
	Terreneuvian	Fortunian											529
													538.8