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
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 594 collections

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International Chronostratigraphic Timescale			Cambrian Epochs	Cambrian of North America		Cambrian of West Avalonia	Cambrian of Kazakhstan	Cambrian of Britain		Ordovician of the Baltic
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	Late Cambrian		Franconian †/Dresbachian/Millardan		Batyrbaian	Merioneth	Dolgellian/Trempealeauan		Pakerort			485.4
														486.3 *
														486.5
				Sunwaptan										487.5
									Festiniogian					489.2 *
		Jiangshanian												489.5
							Aksaian							490.7 *
							Sakian							492.2 *
				Steptoean										493 *
									Maentwrogian					493.1 *
		Paibian							Maentwrogian					494
	Miaolingian	Guzhangian	Middle Cambrian	Marjumian	Albertian †		Ayusokkanian	St Davids						497
						Arcadian	Ayusokkanian							498.4
														499.5
		Drumian					Zhanaarykian							500.5
		Drumian					Tuesaian							503
		Wuliuan		Topazan			Tuesaian							504.5
				Topazan										505.3
				Delamaran										506.5
	Series 2	Stage 4	Early Cambrian		Waucoban †	Branchian		Caerfai						509
							Toyonian							510 *
				Dyeran			Toyonian							511 *
							Botomian							512.5 *
		Stage 3												514
				Montezuman										514.8 *
							Atdabanian							515.6 *
						Placentian								517.1
				Begadean										519.9 *
	Terreneuvian	Stage 2					Tommotian							521
		Stage 2												525.5
		Fortunian												529
														538.8