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 Siberia			Cambrian of North America		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		Franconian †/Dresbachian/Millardan	Niuchehean	Taoyuanian †	Late Cambrian	485.4
		Stage 10								Sunwaptan		Niuchehean			487.5
		Jiangshanian										Jiangshanian			489.5
							Aksaian								490.7 *
							Sakian								492.2 *
										Steptoean					493 *
		Paibian										Paibian			494
									Ensyan †/Maduan/Nganasanian						494.7 *
									Ensyan †/Maduan/Nganasanian				Waergangian †/Youshuanian		494.9 *
	Miaolingian	Guzhangian					Ayusokkanian			Marjumian	Albertian †	Guzhangian	Wangcunian †	Middle Cambrian	497
		Guzhangian					Mayan/Menevian					Guzhangian			499.5
		Drumian					Mayan/Menevian					Drumian			500.5
		Wuliuan					Amgan/Solvan			Topazan		Wuliuan/Taijangian			504.5
		Wuliuan								Delamaran		Wuliuan/Taijangian			506.5
	Series 2	Stage 4									Waucoban †	Duyunian		Early Cambrian	509
							Toyonian	Lenian †							510 *
							Toyonian			Dyeran					511 *
							Botomian								512.5 *
		Stage 3										Nangaoian			514
										Montezuman					514.8 *
							Atdabanian			Montezuman					515.6 *
							Atdabanian			Begadean					519.9 *
	Terreneuvian	Stage 2					Tommotian					Meishucunian			521
		Stage 2					Nemakit-Daldynian								525.5
		Fortunian						Manykaian †							529
		Fortunian						Manykaian †				Jinnigian			530.7
															538.8