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 4548 collections

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International Chronostratigraphic Timescale			Ordovician of Britain				Cambrian of North America		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						Franconian †/Dresbachian/Millardan	Niuchehean	Taoyuanian †	Merioneth	Dolgellian/Trempealeauan	Datsonian				Batyrbaian	Tavgian †	Ketyan †/Yurakian	Late Cambrian	485.4
													Payntonian								486.8 *
							Sunwaptan														487.5
												Festiniogian									489.2 *
		Jiangshanian							Jiangshanian				Iverian								489.5
																	Aksaian				490.7 *
																	Sakian				492.2 *
							Steptoean														493 *
												Maentwrogian									493.1 *
		Paibian							Paibian				Idamean								494
																			Ensyan †/Maduan/Nganasanian		494.7 *
										Waergangian †/Youshuanian									Ensyan †/Maduan/Nganasanian		494.9 *
	Miaolingian	Guzhangian					Marjumian	Albertian †	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					Topazan		Wuliuan/Taijangian				Templetonian				Amgan/Solvan				504.5
							Delamaran						Templetonian								506.5
													Ordian								507.8 *
	Series 2	Stage 4						Waucoban †	Duyunian		Caerfai									Early Cambrian	509
																	Toyonian	Lenian †			510 *
																					510.8 *
							Dyeran														511 *
																	Botomian				512.5 *
		Stage 3							Nangaoian												514
							Montezuman														514.8 *
							Montezuman										Atdabanian				515.6 *
							Begadean										Atdabanian				519.9 *
	Terreneuvian	Stage 2							Meishucunian								Tommotian				521
		Stage 2															Nemakit-Daldynian				525.5
		Fortunian																Manykaian †			529
		Fortunian							Jinnigian									Manykaian †			530.7
																					538.8