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			Cambrian of Siberia			Cambrian Epochs	Ordovician of Australia
Ordovician	Late Ordovician	Hirnantian	Ashgill	Hirnantian			Hirnantian	Xiaoxita †/Shikou	Wufeng †					Bolindian	443.8
		Katian		Rawtheyan			Chientangkiangian								445.2
				Cautleyan											448.9 *
				Cautleyan										Eastonian	449 *
				Pusgillian											449.3 *
				Pusgillian			Neichianshanian/Hanjiang								449.5
			Caradoc	Streffordian	Onnian †										449.6 *
				Cheneyan											451.5 *
				Cheneyan										Gisbornian	452 *
				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			Darriwilian	Guniu †/Hulo						Darriwilian	458.4
				Abereiddian/Early Llanvirn				Guniu †/Hulo							461.3 *
								Hunjiang †	Dawan †/Daobaowan/Ningkuo						466.3 *
		Dapingian					Dapingian							Yapeenian	467.3
			Arenig	Fennian										Yapeenian	468.4 *
														Castlemainian	468.5 *
	Early Ordovician	Floian					Yiyangian							Chewtonian	470
				Whitlandian										Chewtonian	471.1 *
														Bendigonian	471.8 *
														Lancefieldian	473.5 *
				Moridunian											474.3 *
		Tremadocian	Tremadoc	Migneintian			Xinchangian								477.7
				Migneintian					Lianghekou †						477.9 *
				Cressagian											480.8 *
														Warendian	482.8 *
										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