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 Australia	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					Datsonian			Franconian †/Dresbachian/Millardan	Late Cambrian	485.4
							Payntonian					486.8 *
							Payntonian		Sunwaptan			487.5
		Jiangshanian					Iverian		Sunwaptan			489.5
		Jiangshanian					Iverian		Steptoean			493 *
		Paibian					Idamean		Steptoean			494
	Miaolingian	Guzhangian					Mindyallan		Marjumian	Albertian †	Middle Cambrian	497
		Guzhangian					Boomerangian					499
		Drumian					Undillan					500.5
		Drumian					Floran					503
		Wuliuan					Templetonian		Topazan			504.5
							Templetonian		Delamaran			506.5
							Ordian					507.8 *
	Series 2	Stage 4					Ordian			Waucoban †	Early Cambrian	509
												510.8 *
									Dyeran			511 *
		Stage 3							Dyeran			514
									Montezuman			514.8 *
									Begadean			519.9 *
	Terreneuvian	Stage 2										521
	Terreneuvian	Fortunian										529
												538.8