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 4547 collections

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International Chronostratigraphic Timescale			Ordovician of Britain				Cambrian of Kazakhstan	Cambrian 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			Ungurian									477.7
				Cressagian												480.8 *
				Cressagian						Mansian †						483.55 *
										Mansian †						485 *
Cambrian	Furongian	Stage 10					Batyrbaian	Merioneth	Dolgellian/Trempealeauan	Batyrbaian	Tavgian †	Ketyan †/Yurakian	Niuchehean	Taoyuanian †	Late Cambrian	485.4
		Stage 10							Festiniogian				Niuchehean			489.2 *
		Jiangshanian											Jiangshanian			489.5
							Aksaian			Aksaian						490.7 *
							Sakian			Sakian						492.2 *
									Maentwrogian							493.1 *
		Paibian											Paibian			494
												Ensyan †/Maduan/Nganasanian				494.7 *
												Ensyan †/Maduan/Nganasanian		Waergangian †/Youshuanian		494.9 *
	Miaolingian	Guzhangian					Ayusokkanian	St Davids		Ayusokkanian			Guzhangian	Wangcunian †	Middle Cambrian	497
		Guzhangian								Mayan/Menevian			Guzhangian			499.5
		Drumian					Zhanaarykian						Drumian			500.5
		Drumian					Tuesaian						Drumian			503
		Wuliuan					Tuesaian			Amgan/Solvan			Wuliuan/Taijangian			504.5
		Wuliuan											Wuliuan/Taijangian			505.3
	Series 2	Stage 4						Caerfai					Duyunian		Early Cambrian	509
							Toyonian			Toyonian	Lenian †					510 *
							Botomian			Botomian						512.5 *
		Stage 3					Botomian			Botomian			Nangaoian			514
		Stage 3					Atdabanian			Atdabanian			Nangaoian			515.6 *
	Terreneuvian	Stage 2					Tommotian			Tommotian			Meishucunian			521
		Stage 2								Nemakit-Daldynian						525.5
		Fortunian									Manykaian †					529
		Fortunian									Manykaian †		Jinnigian			530.7
																538.8