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
B. D. Webby. 1998. Steps toward a global standard for Ordovician stratigraphy. Newsletters in Stratigraphy 36:1-33 view
D. H. Erwin and S. A. Bowring. 2004. Cambrian time scale. 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		Ordovician of North America					Ordovician of Britain				Cambrian of Kazakhstan	Cambrian of Siberia
Ordovician	Late Ordovician	Hirnantian				Cincinnatian	Gamachian				Ashgill	Hirnantian							443.8
		Katian					Gamachian					Rawtheyan							445.2
							Richmondian					Rawtheyan							446 *
												Cautleyan							448.9 *
												Pusgillian							449.3 *
											Caradoc	Streffordian	Onnian †						449.6 *
							Maysvillian	Rocklandian †/Shermanian/Ashbyan/Kirkfieldian/Blackriveran/Wildernessian/Trentonian/Franklinian											449.8 *
							Edenian												450.4 *
						Mohawkian	Chatfieldian												451.1 *
												Cheneyan							451.5 *
												Burrellian							452.7 *
		Sandbian																	453
													Actonian †						453.2 *
							Turinian						Actonian †						453.7 *
													Marshbrookian †	Woolstonian †					454.2 *
													Longvillian †						455.2 *
												Aurelucian							456.8 *
						Whiterockian		Canadian †	Chazyan †/Marmor										457 *
													Soudleyan †/Harnagian/Costonian						457.4 *
	Middle Ordovician	Darriwilian									Llanvirn	Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn							458.4
		Darriwilian										Abereiddian/Early Llanvirn							461.3 *
		Dapingian										Abereiddian/Early Llanvirn							467.3
											Arenig	Fennian							468.4 *
							Rangerian												469.1 *
	Early Ordovician	Floian				Ibexian	Blackhillsian		Jeffersonian †	Cassinian †									470
							Blackhillsian					Whitlandian							471.1 *
							Tulean					Whitlandian							473.9 *
												Moridunian							474.3 *
		Tremadocian									Tremadoc	Migneintian			Ungurian				477.7
							Stairsian					Migneintian							480.3 *
							Stairsian					Cressagian							480.8 *
							Skullrockian			Demingian †									482 *
																Mansian †			483.55 *
																Mansian †			485 *
Cambrian	Furongian	Stage 10	Late Cambrian		Franconian †/Dresbachian/Millardan										Batyrbaian	Batyrbaian	Tavgian †	Ketyan †/Yurakian	485.4
		Stage 10		Sunwaptan															487.5
		Jiangshanian																	489.5
															Aksaian	Aksaian			490.7 *
															Sakian	Sakian			492.2 *
				Steptoean															493 *
		Paibian																	494
		Paibian																Ensyan †/Maduan/Nganasanian	494.7 *
	Miaolingian	Guzhangian	Middle Cambrian	Marjumian	Albertian †										Ayusokkanian	Ayusokkanian			497
		Guzhangian														Mayan/Menevian			499.5
		Drumian													Zhanaarykian				500.5
		Drumian													Tuesaian				503
		Wuliuan		Topazan											Tuesaian	Amgan/Solvan			504.5
				Topazan															505.3
				Delamaran															506.5
	Series 2	Stage 4	Early Cambrian		Waucoban †														509
															Toyonian	Toyonian	Lenian †		510 *
				Dyeran											Toyonian	Toyonian			511 *
															Botomian	Botomian			512.5 *
		Stage 3																	514
				Montezuman															514.8 *
				Montezuman											Atdabanian	Atdabanian			515.6 *
				Begadean											Atdabanian	Atdabanian			519.9 *
	Terreneuvian	Stage 2													Tommotian	Tommotian			521
		Stage 2														Nemakit-Daldynian			525.5
		Fortunian														Nemakit-Daldynian	Manykaian †		529
																			538.8