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
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 4546 collections

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International Chronostratigraphic Timescale			Ordovician of Britain				Ordovician of China			Cambrian of China		Cambrian Epochs
Ordovician	Late Ordovician	Hirnantian	Ashgill	Hirnantian			Hirnantian	Xiaoxita †/Shikou	Wufeng †				443.8
		Katian		Rawtheyan			Chientangkiangian						445.2
				Cautleyan									448.9 *
				Pusgillian									449.3 *
				Pusgillian			Neichianshanian/Hanjiang						449.5
			Caradoc	Streffordian	Onnian †								449.6 *
				Cheneyan									451.5 *
				Burrellian									452.7 *
		Sandbian											453
					Actonian †								453.2 *
					Marshbrookian †	Woolstonian †							454.2 *
					Longvillian †								455.2 *
				Aurelucian	Longvillian †								456.8 *
				Aurelucian	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
		Dapingian	Arenig	Fennian			Dapingian						468.4 *
	Early Ordovician	Floian		Fennian			Yiyangian						470
				Whitlandian									471.1 *
				Moridunian									474.3 *
		Tremadocian	Tremadoc	Migneintian			Xinchangian						477.7
				Migneintian					Lianghekou †				477.9 *
				Cressagian									480.8 *
													485 *
Cambrian	Furongian	Stage 10								Niuchehean	Taoyuanian †	Late Cambrian	485.4
		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