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 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	Batyrbaian	Merioneth	Dolgellian/Trempealeauan		Pakerort			485.4
											486.3 *
											486.5
						Festiniogian					489.2 *
		Jiangshanian									489.5
				Aksaian							490.7 *
				Sakian							492.2 *
						Maentwrogian					493.1 *
		Paibian				Maentwrogian					494
	Miaolingian	Guzhangian	Middle Cambrian	Ayusokkanian	St Davids						497
		Guzhangian									499.5
		Drumian		Zhanaarykian							500.5
		Drumian		Tuesaian							503
		Wuliuan		Tuesaian							504.5
		Wuliuan									505.3
	Series 2	Stage 4	Early Cambrian		Caerfai						509
				Toyonian							510 *
				Botomian							512.5 *
		Stage 3		Botomian							514
		Stage 3		Atdabanian							515.6 *
	Terreneuvian	Stage 2		Tommotian							521
		Stage 2									525.5
		Fortunian									529
											538.8