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 4548 collections

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International Chronostratigraphic Timescale			Ordovician of Britain				Ordovician of Ibero-Bohemia				Cambrian of Britain		Cambrian of Kazakhstan	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						Ungurian	Xinchangian							477.7
				Migneintian												Lianghekou †					477.9 *
				Cressagian																	480.8 *
				Cressagian													Mansian †				483.55 *
																	Mansian †				485 *
Cambrian	Furongian	Stage 10									Merioneth	Dolgellian/Trempealeauan	Batyrbaian				Batyrbaian	Tavgian †	Ketyan †/Yurakian	Late Cambrian	485.4
		Stage 10										Festiniogian									489.2 *
		Jiangshanian																			489.5
													Aksaian				Aksaian				490.7 *
													Sakian				Sakian				492.2 *
												Maentwrogian									493.1 *
		Paibian																			494
		Paibian																	Ensyan †/Maduan/Nganasanian		494.7 *
	Miaolingian	Guzhangian									St Davids		Ayusokkanian				Ayusokkanian			Middle Cambrian	497
		Guzhangian															Mayan/Menevian				499.5
		Drumian											Zhanaarykian								500.5
		Drumian											Tuesaian								503
		Wuliuan											Tuesaian				Amgan/Solvan				504.5
		Wuliuan																			505.3
	Series 2	Stage 4									Caerfai									Early Cambrian	509
													Toyonian				Toyonian	Lenian †			510 *
													Botomian				Botomian				512.5 *
		Stage 3											Botomian				Botomian				514
		Stage 3											Atdabanian				Atdabanian				515.6 *
	Terreneuvian	Stage 2											Tommotian				Tommotian				521
		Stage 2															Nemakit-Daldynian				525.5
		Fortunian															Nemakit-Daldynian	Manykaian †			529
																					538.8