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
F. M. Gradstein, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 view
D. H. Erwin and S. A. Bowring. 2004. Cambrian time scale. 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 China		Cambrian of Britain		Cambrian of Australia	Ordovician of China			Cambrian of Siberia			Cambrian Epochs
Ordovician	Late Ordovician	Hirnantian	Ashgill	Hirnantian								Hirnantian	Xiaoxita †/Shikou	Wufeng †					443.8
		Katian		Rawtheyan								Chientangkiangian							445.2
				Cautleyan															448.9 *
				Pusgillian															449.3 *
				Pusgillian								Neichianshanian/Hanjiang							449.5
			Caradoc	Streffordian	Onnian †														449.6 *
				Cheneyan															451.5 *
				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						458.4
				Abereiddian/Early Llanvirn									Guniu †/Hulo						461.3 *
													Hunjiang †	Dawan †/Daobaowan/Ningkuo					466.3 *
		Dapingian										Dapingian							467.3
		Dapingian	Arenig	Fennian								Dapingian							468.4 *
	Early Ordovician	Floian		Fennian								Yiyangian							470
				Whitlandian															471.1 *
				Moridunian															474.3 *
		Tremadocian	Tremadoc	Migneintian								Xinchangian							477.7
				Migneintian										Lianghekou †					477.9 *
				Cressagian															480.8 *
				Cressagian											Mansian †				483.55 *
															Mansian †				485 *
Cambrian	Furongian	Stage 10					Niuchehean	Taoyuanian †	Merioneth	Dolgellian/Trempealeauan	Datsonian				Batyrbaian	Tavgian †	Ketyan †/Yurakian	Late Cambrian	485.4
										Dolgellian/Trempealeauan	Payntonian								486.8 *
										Festiniogian	Payntonian								489.2 *
		Jiangshanian					Jiangshanian				Iverian								489.5
															Aksaian				490.7 *
															Sakian				492.2 *
										Maentwrogian									493.1 *
		Paibian					Paibian				Idamean								494
																	Ensyan †/Maduan/Nganasanian		494.7 *
								Waergangian †/Youshuanian									Ensyan †/Maduan/Nganasanian		494.9 *
	Miaolingian	Guzhangian					Guzhangian	Wangcunian †	St Davids		Mindyallan				Ayusokkanian			Middle Cambrian	497
											Boomerangian				Ayusokkanian				499
											Boomerangian				Mayan/Menevian				499.5
		Drumian					Drumian				Undillan								500.5
		Drumian					Drumian				Floran								503
		Wuliuan					Wuliuan/Taijangian				Templetonian				Amgan/Solvan				504.5
		Wuliuan					Wuliuan/Taijangian				Ordian								507.8 *
	Series 2	Stage 4					Duyunian		Caerfai									Early Cambrian	509
															Toyonian	Lenian †			510 *
															Toyonian				510.8 *
															Botomian				512.5 *
		Stage 3					Nangaoian								Botomian				514
		Stage 3					Nangaoian								Atdabanian				515.6 *
	Terreneuvian	Stage 2					Meishucunian								Tommotian				521
		Stage 2													Nemakit-Daldynian				525.5
		Fortunian														Manykaian †			529
		Fortunian					Jinnigian									Manykaian †			530.7
																			538.8