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

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 China		Cambrian Epochs	Cambrian of Kazakhstan	Cambrian of North America
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
			Tremadoc	Cressagian									480.8 *
													485 *
Cambrian	Furongian	Stage 10					Niuchehean	Taoyuanian †	Late Cambrian	Batyrbaian		Franconian †/Dresbachian/Millardan	485.4
		Stage 10					Niuchehean				Sunwaptan		487.5
		Jiangshanian					Jiangshanian						489.5
										Aksaian			490.7 *
										Sakian			492.2 *
											Steptoean		493 *
		Paibian					Paibian						494
		Paibian					Paibian	Waergangian †/Youshuanian					494.9 *
	Miaolingian	Guzhangian					Guzhangian	Wangcunian †	Middle Cambrian	Ayusokkanian	Marjumian	Albertian †	497
		Guzhangian					Guzhangian						499.5
		Drumian					Drumian			Zhanaarykian			500.5
		Drumian					Drumian			Tuesaian			503
		Wuliuan					Wuliuan/Taijangian			Tuesaian	Topazan		504.5
											Topazan		505.3
											Delamaran		506.5
	Series 2	Stage 4					Duyunian		Early Cambrian			Waucoban †	509
										Toyonian			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					Meishucunian			Tommotian			521
		Stage 2											525.5
		Fortunian											529
		Fortunian					Jinnigian						530.7
													538.8