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 4546 collections

Show more time

Show linear time

International Chronostratigraphic Timescale			Ordovician of Britain				Cambrian of China		Cambrian of North America		Cambrian Epochs
Ordovician	Late Ordovician	Hirnantian	Ashgill	Hirnantian								443.8
		Katian		Rawtheyan								445.2
				Cautleyan								448.9 *
				Pusgillian								449.3 *
			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								458.4
		Darriwilian		Abereiddian/Early Llanvirn								461.3 *
		Dapingian		Abereiddian/Early Llanvirn								467.3
		Dapingian	Arenig	Fennian								468.4 *
	Early Ordovician	Floian		Fennian								470
				Whitlandian								471.1 *
				Moridunian								474.3 *
		Tremadocian	Tremadoc	Migneintian								477.7
			Tremadoc	Cressagian								480.8 *
												485 *
Cambrian	Furongian	Stage 10					Niuchehean	Taoyuanian †		Franconian †/Dresbachian/Millardan	Late Cambrian	485.4
		Stage 10					Niuchehean		Sunwaptan			487.5
		Jiangshanian					Jiangshanian		Sunwaptan			489.5
		Jiangshanian					Jiangshanian		Steptoean			493 *
		Paibian					Paibian					494
		Paibian					Paibian	Waergangian †/Youshuanian				494.9 *
	Miaolingian	Guzhangian					Guzhangian	Wangcunian †	Marjumian	Albertian †	Middle Cambrian	497
		Drumian					Drumian	Wangcunian †	Marjumian			500.5
		Wuliuan					Wuliuan/Taijangian		Topazan			504.5
		Wuliuan					Wuliuan/Taijangian		Delamaran			506.5
	Series 2	Stage 4					Duyunian		Delamaran	Waucoban †	Early Cambrian	509
		Stage 4					Duyunian		Dyeran			511 *
		Stage 3					Nangaoian		Dyeran			514
									Montezuman			514.8 *
									Begadean			519.9 *
	Terreneuvian	Stage 2					Meishucunian					521
		Fortunian					Meishucunian					529
		Fortunian					Jinnigian					530.7
												538.8