PBDB Timescale

Ordovician of Britain

The interval definitions in this timescale are derived from the following sources:

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
F. M. Gradstein, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 view

There are 14 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 4547 collections

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International Chronostratigraphic Timescale			Ordovician of Britain				Ordovician of North America					Ordovician of China			Cambrian of China		Cambrian Epochs
Ordovician	Late Ordovician	Hirnantian	Ashgill	Hirnantian			Cincinnatian	Gamachian				Hirnantian	Xiaoxita †/Shikou	Wufeng †				443.8
		Katian		Rawtheyan				Gamachian				Chientangkiangian						445.2
				Rawtheyan				Richmondian										446 *
				Cautleyan														448.9 *
				Pusgillian														449.3 *
				Pusgillian								Neichianshanian/Hanjiang						449.5
			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								Darriwilian	Guniu †/Hulo					458.4
				Abereiddian/Early Llanvirn									Guniu †/Hulo					461.3 *
													Hunjiang †	Dawan †/Daobaowan/Ningkuo				466.3 *
		Dapingian										Dapingian						467.3
			Arenig	Fennian														468.4 *
								Rangerian										469.1 *
	Early Ordovician	Floian					Ibexian	Blackhillsian		Jeffersonian †	Cassinian †	Yiyangian						470
				Whitlandian				Blackhillsian										471.1 *
				Whitlandian				Tulean										473.9 *
				Moridunian														474.3 *
		Tremadocian	Tremadoc	Migneintian								Xinchangian						477.7
														Lianghekou †				477.9 *
								Stairsian										480.3 *
				Cressagian				Stairsian										480.8 *
				Cressagian				Skullrockian			Demingian †							482 *
											Demingian †							485 *
Cambrian	Furongian	Stage 10													Niuchehean	Taoyuanian †	Late Cambrian	485.4
		Stage 10													Niuchehean			487.5
		Jiangshanian													Jiangshanian			489.5
		Paibian													Paibian			494
		Paibian													Paibian	Waergangian †/Youshuanian		494.9 *
	Miaolingian	Guzhangian													Guzhangian	Wangcunian †	Middle Cambrian	497
		Drumian													Drumian	Wangcunian †		500.5
		Wuliuan													Wuliuan/Taijangian			504.5
	Series 2	Stage 4													Duyunian		Early Cambrian	509
	Series 2	Stage 3													Nangaoian			514
	Terreneuvian	Stage 2													Meishucunian			521
		Fortunian													Meishucunian			529
		Fortunian													Jinnigian			530.7
																		538.8