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
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
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	Ordovician of North America					Cambrian of Australia	Ordovician of the Baltic				Cambrian of Kazakhstan
Ordovician	Late Ordovician	Hirnantian		Cincinnatian	Gamachian					Harju	Porkuni				443.8
		Katian			Gamachian						Pirgu				445.2
					Richmondian						Pirgu				446 *
					Richmondian						Vormsi				449.6 *
					Maysvillian	Rocklandian †/Shermanian/Ashbyan/Kirkfieldian/Blackriveran/Wildernessian/Trentonian/Franklinian					Vormsi				449.8 *
					Maysvillian						Nabala	Johvi †			450 *
					Edenian						Nabala				450.4 *
					Edenian					Viru	Rakvere				450.6 *
				Mohawkian	Chatfieldian						Rakvere				451.1 *
											Oandu				452 *
		Sandbian									Keila	Idavere †			453
					Turinian						Keila				453.7 *
											Haljala				453.9
											Kukruse				456.4 *
				Whiterockian		Canadian †	Chazyan †/Marmor				Kukruse				457 *
											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													467.3
					Rangerian										469.1 *
					Rangerian						Billingen				469.3 *
	Early Ordovician	Floian		Ibexian	Blackhillsian		Jeffersonian †	Cassinian †							470
												Latorp †			470.1 *
											Hunneberg				473.7 *
					Tulean										473.9 *
		Tremadocian			Tulean									Ungurian	477.7
					Stairsian										480.3 *
					Stairsian						Varangu				481.3 *
					Skullrockian			Demingian †			Varangu				482 *
								Demingian †			Pakerort				482.2 *
Cambrian	Furongian	Stage 10	Late Cambrian						Datsonian		Pakerort			Batyrbaian	485.4
															486.3 *
															486.5
									Payntonian						486.8 *
									Payntonian						487.5
		Jiangshanian							Iverian						489.5
														Aksaian	490.7 *
														Sakian	492.2 *
		Paibian							Idamean					Sakian	494
	Miaolingian	Guzhangian	Middle Cambrian						Mindyallan					Ayusokkanian	497
									Boomerangian					Ayusokkanian	499
									Boomerangian						499.5
		Drumian							Undillan					Zhanaarykian	500.5
		Drumian							Floran					Tuesaian	503
		Wuliuan							Templetonian					Tuesaian	504.5
									Templetonian						505.3
									Ordian						507.8 *
	Series 2	Stage 4	Early Cambrian												509
														Toyonian	510 *
														Toyonian	510.8 *
														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