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 4546 collections

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International Chronostratigraphic Timescale			Ordovician of Britain				Ordovician of Australia	Cambrian of North America		Cambrian Epochs
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							477.7
				Cressagian							480.8 *
				Cressagian			Warendian				482.8 *
							Warendian				485 *
Cambrian	Furongian	Stage 10							Franconian †/Dresbachian/Millardan	Late Cambrian	485.4
		Stage 10						Sunwaptan			487.5
		Jiangshanian						Sunwaptan			489.5
		Jiangshanian						Steptoean			493 *
		Paibian						Steptoean			494
	Miaolingian	Guzhangian						Marjumian	Albertian †	Middle Cambrian	497
		Drumian						Marjumian			500.5
		Wuliuan						Topazan			504.5
		Wuliuan						Delamaran			506.5
	Series 2	Stage 4						Delamaran	Waucoban †	Early Cambrian	509
		Stage 4						Dyeran			511 *
		Stage 3						Dyeran			514
								Montezuman			514.8 *
								Begadean			519.9 *
	Terreneuvian	Stage 2									521
	Terreneuvian	Fortunian									529
											538.8