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				Ordovician of Australia	Cambrian Epochs	Cambrian of Kazakhstan	Cambrian of North America
Ordovician	Late Ordovician	Hirnantian	Ashgill	Hirnantian			Bolindian					443.8
		Katian		Rawtheyan								445.2
				Cautleyan								448.9 *
				Cautleyan			Eastonian					449 *
				Pusgillian								449.3 *
			Caradoc	Streffordian	Onnian †							449.6 *
				Cheneyan								451.5 *
				Cheneyan			Gisbornian					452 *
				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			Darriwilian					458.4
		Darriwilian		Abereiddian/Early Llanvirn			Darriwilian					461.3 *
		Dapingian		Abereiddian/Early Llanvirn			Yapeenian					467.3
			Arenig	Fennian			Yapeenian					468.4 *
							Castlemainian					468.5 *
	Early Ordovician	Floian					Chewtonian					470
				Whitlandian			Chewtonian					471.1 *
							Bendigonian					471.8 *
							Lancefieldian					473.5 *
				Moridunian								474.3 *
		Tremadocian	Tremadoc	Migneintian					Ungurian			477.7
				Cressagian								480.8 *
				Cressagian			Warendian					482.8 *
							Warendian					485 *
Cambrian	Furongian	Stage 10						Late Cambrian	Batyrbaian		Franconian †/Dresbachian/Millardan	485.4
		Stage 10								Sunwaptan		487.5
		Jiangshanian										489.5
									Aksaian			490.7 *
									Sakian			492.2 *
										Steptoean		493 *
		Paibian								Steptoean		494
	Miaolingian	Guzhangian						Middle Cambrian	Ayusokkanian	Marjumian	Albertian †	497
		Guzhangian										499.5
		Drumian							Zhanaarykian			500.5
		Drumian							Tuesaian			503
		Wuliuan							Tuesaian	Topazan		504.5
										Topazan		505.3
										Delamaran		506.5
	Series 2	Stage 4						Early Cambrian			Waucoban †	509
									Toyonian			510 *
									Toyonian	Dyeran		511 *
									Botomian			512.5 *
		Stage 3										514
										Montezuman		514.8 *
									Atdabanian	Montezuman		515.6 *
									Atdabanian	Begadean		519.9 *
	Terreneuvian	Stage 2							Tommotian			521
		Stage 2										525.5
		Fortunian										529
												538.8