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 China			Ordovician of Ibero-Bohemia				Cambrian of Siberia			Cambrian of Kazakhstan	Cambrian of North America		Cambrian Epochs
Ordovician	Late Ordovician	Hirnantian	Ashgill	Hirnantian			Hirnantian	Xiaoxita †/Shikou	Wufeng †	Kosovian											443.8
		Katian		Rawtheyan			Chientangkiangian			Kralodvorian	Bohdalec †										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 *
								Hunjiang †	Dawan †/Daobaowan/Ningkuo		Sarka †										466.3 *
		Dapingian					Dapingian				Klabava †										467.3
										Arenigian											468
			Arenig	Fennian																	468.4 *
	Early Ordovician	Floian		Fennian			Yiyangian														470
				Whitlandian																	471.1 *
				Moridunian																	474.3 *
		Tremadocian	Tremadoc	Migneintian			Xinchangian			Tremadocian							Ungurian				477.7
				Migneintian					Lianghekou †												477.9 *
				Cressagian																	480.8 *
				Cressagian										Mansian †							483.55 *
														Mansian †							485 *
Cambrian	Furongian	Stage 10												Batyrbaian	Tavgian †	Ketyan †/Yurakian	Batyrbaian		Franconian †/Dresbachian/Millardan	Late Cambrian	485.4
		Stage 10																Sunwaptan			487.5
		Jiangshanian																			489.5
														Aksaian			Aksaian				490.7 *
														Sakian			Sakian				492.2 *
																		Steptoean			493 *
		Paibian																			494
		Paibian														Ensyan †/Maduan/Nganasanian					494.7 *
	Miaolingian	Guzhangian												Ayusokkanian			Ayusokkanian	Marjumian	Albertian †	Middle Cambrian	497
		Guzhangian												Mayan/Menevian							499.5
		Drumian															Zhanaarykian				500.5
		Drumian															Tuesaian				503
		Wuliuan												Amgan/Solvan			Tuesaian	Topazan			504.5
																		Topazan			505.3
																		Delamaran			506.5
	Series 2	Stage 4																	Waucoban †	Early Cambrian	509
														Toyonian	Lenian †		Toyonian				510 *
														Toyonian			Toyonian	Dyeran			511 *
														Botomian			Botomian				512.5 *
		Stage 3																			514
																		Montezuman			514.8 *
														Atdabanian			Atdabanian	Montezuman			515.6 *
														Atdabanian			Atdabanian	Begadean			519.9 *
	Terreneuvian	Stage 2												Tommotian			Tommotian				521
		Stage 2												Nemakit-Daldynian							525.5
		Fortunian												Nemakit-Daldynian	Manykaian †						529
																					538.8