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
D. H. Erwin and S. A. Bowring. 2004. Cambrian time scale. 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 Siberia			Cambrian of Australia	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
				Cressagian										480.8 *
				Cressagian					Mansian †					483.55 *
									Mansian †					485 *
Cambrian	Furongian	Stage 10					Niuchehean	Taoyuanian †	Batyrbaian	Tavgian †	Ketyan †/Yurakian	Datsonian	Late Cambrian	485.4
		Stage 10					Niuchehean					Payntonian		486.8 *
		Jiangshanian					Jiangshanian					Iverian		489.5
									Aksaian					490.7 *
									Sakian					492.2 *
		Paibian					Paibian					Idamean		494
											Ensyan †/Maduan/Nganasanian			494.7 *
								Waergangian †/Youshuanian			Ensyan †/Maduan/Nganasanian			494.9 *
	Miaolingian	Guzhangian					Guzhangian	Wangcunian †	Ayusokkanian			Mindyallan	Middle Cambrian	497
									Ayusokkanian			Boomerangian		499
									Mayan/Menevian			Boomerangian		499.5
		Drumian					Drumian					Undillan		500.5
		Drumian					Drumian					Floran		503
		Wuliuan					Wuliuan/Taijangian		Amgan/Solvan			Templetonian		504.5
		Wuliuan					Wuliuan/Taijangian					Ordian		507.8 *
	Series 2	Stage 4					Duyunian						Early Cambrian	509
									Toyonian	Lenian †				510 *
									Toyonian					510.8 *
									Botomian					512.5 *
		Stage 3					Nangaoian		Botomian					514
		Stage 3					Nangaoian		Atdabanian					515.6 *
	Terreneuvian	Stage 2					Meishucunian		Tommotian					521
		Stage 2							Nemakit-Daldynian					525.5
		Fortunian								Manykaian †				529
		Fortunian					Jinnigian			Manykaian †				530.7
														538.8