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 Kazakhstan	Cambrian of Australia	Ordovician of China			Cambrian of North America		Cambrian Epochs
Ordovician	Late Ordovician	Hirnantian	Ashgill	Hirnantian					Hirnantian	Xiaoxita †/Shikou	Wufeng †				443.8
		Katian		Rawtheyan					Chientangkiangian						445.2
				Cautleyan											448.9 *
				Pusgillian											449.3 *
				Pusgillian					Neichianshanian/Hanjiang						449.5
			Caradoc	Streffordian	Onnian †										449.6 *
				Cheneyan											451.5 *
				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	Guniu †/Hulo					458.4
				Abereiddian/Early Llanvirn						Guniu †/Hulo					461.3 *
										Hunjiang †	Dawan †/Daobaowan/Ningkuo				466.3 *
		Dapingian							Dapingian						467.3
		Dapingian	Arenig	Fennian					Dapingian						468.4 *
	Early Ordovician	Floian		Fennian					Yiyangian						470
				Whitlandian											471.1 *
				Moridunian											474.3 *
		Tremadocian	Tremadoc	Migneintian			Ungurian		Xinchangian						477.7
				Migneintian							Lianghekou †				477.9 *
				Cressagian											480.8 *
															485 *
Cambrian	Furongian	Stage 10					Batyrbaian	Datsonian					Franconian †/Dresbachian/Millardan	Late Cambrian	485.4
								Payntonian							486.8 *
								Payntonian				Sunwaptan			487.5
		Jiangshanian						Iverian							489.5
							Aksaian								490.7 *
							Sakian								492.2 *
												Steptoean			493 *
		Paibian						Idamean				Steptoean			494
	Miaolingian	Guzhangian					Ayusokkanian	Mindyallan				Marjumian	Albertian †	Middle Cambrian	497
							Ayusokkanian	Boomerangian							499
								Boomerangian							499.5
		Drumian					Zhanaarykian	Undillan							500.5
		Drumian					Tuesaian	Floran							503
		Wuliuan					Tuesaian	Templetonian				Topazan			504.5
												Topazan			505.3
												Delamaran			506.5
								Ordian							507.8 *
	Series 2	Stage 4											Waucoban †	Early Cambrian	509
							Toyonian								510 *
															510.8 *
												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