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

Show more time

Show linear time

International Chronostratigraphic Timescale			Ordovician of Britain				Cambrian of Britain		Cambrian of Australia	Ordovician of China			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						Xinchangian				477.7
				Migneintian								Lianghekou †		477.9 *
				Cressagian										480.8 *
														485 *
Cambrian	Furongian	Stage 10					Merioneth	Dolgellian/Trempealeauan	Datsonian				Late Cambrian	485.4
								Dolgellian/Trempealeauan	Payntonian					486.8 *
								Festiniogian	Payntonian					489.2 *
		Jiangshanian						Festiniogian	Iverian					489.5
		Jiangshanian						Maentwrogian	Iverian					493.1 *
		Paibian						Maentwrogian	Idamean					494
	Miaolingian	Guzhangian					St Davids		Mindyallan				Middle Cambrian	497
		Guzhangian							Boomerangian					499
		Drumian							Undillan					500.5
		Drumian							Floran					503
		Wuliuan							Templetonian					504.5
		Wuliuan							Ordian					507.8 *
	Series 2	Stage 4					Caerfai		Ordian				Early Cambrian	509
		Stage 4												510.8 *
		Stage 3												514
	Terreneuvian	Stage 2												521
	Terreneuvian	Fortunian												529
														538.8