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 of Britain		Cambrian of China		Cambrian of North America		Cambrian of Siberia			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					Merioneth	Dolgellian/Trempealeauan	Niuchehean	Taoyuanian †		Franconian †/Dresbachian/Millardan	Batyrbaian	Tavgian †	Ketyan †/Yurakian	Late Cambrian	485.4
								Dolgellian/Trempealeauan			Sunwaptan						487.5
								Festiniogian									489.2 *
		Jiangshanian							Jiangshanian								489.5
													Aksaian				490.7 *
													Sakian				492.2 *
											Steptoean						493 *
								Maentwrogian									493.1 *
		Paibian							Paibian								494
															Ensyan †/Maduan/Nganasanian		494.7 *
										Waergangian †/Youshuanian					Ensyan †/Maduan/Nganasanian		494.9 *
	Miaolingian	Guzhangian					St Davids		Guzhangian	Wangcunian †	Marjumian	Albertian †	Ayusokkanian			Middle Cambrian	497
		Guzhangian							Guzhangian				Mayan/Menevian				499.5
		Drumian							Drumian				Mayan/Menevian				500.5
		Wuliuan							Wuliuan/Taijangian		Topazan		Amgan/Solvan				504.5
		Wuliuan							Wuliuan/Taijangian		Delamaran						506.5
	Series 2	Stage 4					Caerfai		Duyunian			Waucoban †				Early Cambrian	509
													Toyonian	Lenian †			510 *
											Dyeran		Toyonian				511 *
													Botomian				512.5 *
		Stage 3							Nangaoian								514
											Montezuman						514.8 *
											Montezuman		Atdabanian				515.6 *
											Begadean		Atdabanian				519.9 *
	Terreneuvian	Stage 2							Meishucunian				Tommotian				521
		Stage 2											Nemakit-Daldynian				525.5
		Fortunian												Manykaian †			529
		Fortunian							Jinnigian					Manykaian †			530.7
																	538.8