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
D. H. Erwin and S. A. Bowring. 2004. Cambrian time scale. 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				Ordovician of Ibero-Bohemia				Ordovician of China			Cambrian of Siberia			Cambrian Epochs
Ordovician	Late Ordovician	Hirnantian	Ashgill	Hirnantian			Kosovian				Hirnantian	Xiaoxita †/Shikou	Wufeng †					443.8
		Katian		Rawtheyan			Kralodvorian	Bohdalec †			Chientangkiangian							445.2
				Cautleyan														448.9 *
				Pusgillian														449.3 *
				Pusgillian							Neichianshanian/Hanjiang							449.5
			Caradoc	Streffordian	Onnian †													449.6 *
				Streffordian			Berounian											449.7 *
				Cheneyan														451.5 *
				Burrellian														452.7 *
		Sandbian																453
					Actonian †													453.2 *
					Marshbrookian †	Woolstonian †												454.2 *
					Longvillian †													455.2 *
									Zahorany †/Vinice	Letna †								456.2 *
				Aurelucian														456.8 *
					Soudleyan †/Harnagian/Costonian													457.4 *
					Soudleyan †/Harnagian/Costonian			Liben †										458 *
	Middle Ordovician	Darriwilian	Llanvirn	Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn							Darriwilian	Guniu †/Hulo						458.4
							Dobrotivian											458.5 *
							Oretanian											459.7 *
				Abereiddian/Early Llanvirn														461.3 *
								Sarka †										461.7 *
								Sarka †				Hunjiang †	Dawan †/Daobaowan/Ningkuo					466.3 *
		Dapingian						Klabava †			Dapingian							467.3
							Arenigian											468
			Arenig	Fennian														468.4 *
	Early Ordovician	Floian		Fennian							Yiyangian							470
				Whitlandian														471.1 *
				Moridunian														474.3 *
		Tremadocian	Tremadoc	Migneintian			Tremadocian				Xinchangian							477.7
				Migneintian									Lianghekou †					477.9 *
				Cressagian														480.8 *
				Cressagian										Mansian †				483.55 *
														Mansian †				485 *
Cambrian	Furongian	Stage 10												Batyrbaian	Tavgian †	Ketyan †/Yurakian	Late Cambrian	485.4
		Jiangshanian												Batyrbaian				489.5
														Aksaian				490.7 *
														Sakian				492.2 *
		Paibian																494
		Paibian														Ensyan †/Maduan/Nganasanian		494.7 *
	Miaolingian	Guzhangian												Ayusokkanian			Middle Cambrian	497
		Guzhangian												Mayan/Menevian				499.5
		Drumian												Mayan/Menevian				500.5
		Wuliuan												Amgan/Solvan				504.5
	Series 2	Stage 4												Amgan/Solvan			Early Cambrian	509
														Toyonian	Lenian †			510 *
														Botomian				512.5 *
		Stage 3												Botomian				514
		Stage 3												Atdabanian				515.6 *
	Terreneuvian	Stage 2												Tommotian				521
		Stage 2												Nemakit-Daldynian				525.5
		Fortunian												Nemakit-Daldynian	Manykaian †			529
																		538.8