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 North America		Ordovician of Australia	Ordovician of China			Cambrian Epochs
Ordovician	Late Ordovician	Hirnantian	Ashgill	Hirnantian					Bolindian	Hirnantian	Xiaoxita †/Shikou	Wufeng †		443.8
		Katian		Rawtheyan						Chientangkiangian				445.2
				Cautleyan										448.9 *
				Cautleyan					Eastonian					449 *
				Pusgillian										449.3 *
				Pusgillian						Neichianshanian/Hanjiang				449.5
			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	Darriwilian	Guniu †/Hulo			458.4
				Abereiddian/Early Llanvirn							Guniu †/Hulo			461.3 *
											Hunjiang †	Dawan †/Daobaowan/Ningkuo		466.3 *
		Dapingian							Yapeenian	Dapingian				467.3
			Arenig	Fennian					Yapeenian					468.4 *
									Castlemainian					468.5 *
	Early Ordovician	Floian							Chewtonian	Yiyangian				470
				Whitlandian					Chewtonian					471.1 *
									Bendigonian					471.8 *
									Lancefieldian					473.5 *
				Moridunian										474.3 *
		Tremadocian	Tremadoc	Migneintian						Xinchangian				477.7
				Migneintian								Lianghekou †		477.9 *
				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