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
D. H. Erwin and S. A. Bowring. 2004. Cambrian time scale. 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				Cambrian of Siberia			Cambrian of China		Cambrian Epochs
Ordovician	Late Ordovician	Hirnantian	Ashgill	Hirnantian									443.8
		Katian		Rawtheyan									445.2
				Cautleyan									448.9 *
				Pusgillian									449.3 *
			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									458.4
		Darriwilian		Abereiddian/Early Llanvirn									461.3 *
		Dapingian		Abereiddian/Early Llanvirn									467.3
		Dapingian	Arenig	Fennian									468.4 *
	Early Ordovician	Floian		Fennian									470
				Whitlandian									471.1 *
				Moridunian									474.3 *
		Tremadocian	Tremadoc	Migneintian									477.7
				Cressagian									480.8 *
				Cressagian			Mansian †						483.55 *
							Mansian †						485 *
Cambrian	Furongian	Stage 10					Batyrbaian	Tavgian †	Ketyan †/Yurakian	Niuchehean	Taoyuanian †	Late Cambrian	485.4
		Jiangshanian					Batyrbaian			Jiangshanian			489.5
							Aksaian						490.7 *
							Sakian						492.2 *
		Paibian								Paibian			494
									Ensyan †/Maduan/Nganasanian				494.7 *
									Ensyan †/Maduan/Nganasanian		Waergangian †/Youshuanian		494.9 *
	Miaolingian	Guzhangian					Ayusokkanian			Guzhangian	Wangcunian †	Middle Cambrian	497
		Guzhangian					Mayan/Menevian			Guzhangian			499.5
		Drumian					Mayan/Menevian			Drumian			500.5
		Wuliuan					Amgan/Solvan			Wuliuan/Taijangian			504.5
	Series 2	Stage 4					Amgan/Solvan			Duyunian		Early Cambrian	509
							Toyonian	Lenian †					510 *
							Botomian						512.5 *
		Stage 3					Botomian			Nangaoian			514
		Stage 3					Atdabanian			Nangaoian			515.6 *
	Terreneuvian	Stage 2					Tommotian			Meishucunian			521
		Stage 2					Nemakit-Daldynian						525.5
		Fortunian						Manykaian †					529
		Fortunian						Manykaian †		Jinnigian			530.7
													538.8