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				Cambrian of Britain		Cambrian of Kazakhstan	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					Ungurian	Tremadocian				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