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
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

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	Ordovician of Britain				Cambrian of North America		Cambrian of Kazakhstan	Ordovician of North America
Ordovician	Late Ordovician	Hirnantian		Ashgill	Hirnantian						Cincinnatian	Gamachian				443.8
		Katian			Rawtheyan							Gamachian				445.2
					Rawtheyan							Richmondian				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 *
						Actonian †						Turinian				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
					Whitlandian							Blackhillsian				471.1 *
					Whitlandian							Tulean				473.9 *
					Moridunian											474.3 *
		Tremadocian		Tremadoc	Migneintian					Ungurian						477.7
					Migneintian							Stairsian				480.3 *
					Cressagian							Stairsian				480.8 *
					Cressagian							Skullrockian			Demingian †	482 *
															Demingian †	485 *
Cambrian	Furongian	Stage 10	Late Cambrian						Franconian †/Dresbachian/Millardan	Batyrbaian						485.4
		Stage 10						Sunwaptan								487.5
		Jiangshanian														489.5
										Aksaian						490.7 *
										Sakian						492.2 *
								Steptoean								493 *
		Paibian						Steptoean								494
	Miaolingian	Guzhangian	Middle Cambrian					Marjumian	Albertian †	Ayusokkanian						497
		Guzhangian														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 †							509
										Toyonian						510 *
								Dyeran		Toyonian						511 *
										Botomian						512.5 *
		Stage 3														514
								Montezuman								514.8 *
								Montezuman		Atdabanian						515.6 *
								Begadean		Atdabanian						519.9 *
	Terreneuvian	Stage 2								Tommotian						521
		Stage 2														525.5
		Fortunian														529
																538.8