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
D. H. Erwin and S. A. Bowring. 2004. Cambrian time scale. 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 Epochs	Cambrian of Kazakhstan	Cambrian of Britain		Cambrian of Siberia			Cambrian of China
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					Late Cambrian	Batyrbaian	Merioneth	Dolgellian/Trempealeauan	Batyrbaian	Tavgian †	Ketyan †/Yurakian	Niuchehean	Taoyuanian †	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					Middle Cambrian	Ayusokkanian	St Davids		Ayusokkanian			Guzhangian	Wangcunian †	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					Early Cambrian		Caerfai					Duyunian		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