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 China		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					Niuchehean	Taoyuanian †	Datsonian				Late Cambrian	485.4
		Stage 10					Niuchehean		Payntonian					486.8 *
		Jiangshanian					Jiangshanian		Iverian					489.5
		Paibian					Paibian		Idamean					494
		Paibian					Paibian	Waergangian †/Youshuanian	Idamean					494.9 *
	Miaolingian	Guzhangian					Guzhangian	Wangcunian †	Mindyallan				Middle Cambrian	497
		Guzhangian					Guzhangian		Boomerangian					499
		Drumian					Drumian		Undillan					500.5
		Drumian					Drumian		Floran					503
		Wuliuan					Wuliuan/Taijangian		Templetonian					504.5
		Wuliuan					Wuliuan/Taijangian		Ordian					507.8 *
	Series 2	Stage 4					Duyunian		Ordian				Early Cambrian	509
		Stage 4					Duyunian							510.8 *
		Stage 3					Nangaoian							514
	Terreneuvian	Stage 2					Meishucunian							521
		Fortunian					Meishucunian							529
		Fortunian					Jinnigian							530.7
														538.8