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 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					Merioneth	Dolgellian/Trempealeauan			Franconian †/Dresbachian/Millardan	Late Cambrian	485.4
								Dolgellian/Trempealeauan		Sunwaptan			487.5
								Festiniogian					489.2 *
		Jiangshanian											489.5
										Steptoean			493 *
								Maentwrogian					493.1 *
		Paibian						Maentwrogian					494
	Miaolingian	Guzhangian					St Davids			Marjumian	Albertian †	Middle Cambrian	497
		Drumian								Marjumian			500.5
		Wuliuan								Topazan			504.5
		Wuliuan								Delamaran			506.5
	Series 2	Stage 4					Caerfai			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