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 North America		Cambrian of Britain		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	Merioneth	Dolgellian/Trempealeauan				Batyrbaian	Tavgian †	Ketyan †/Yurakian	Late Cambrian	485.4
							Sunwaptan			Dolgellian/Trempealeauan								487.5
										Festiniogian								489.2 *
		Jiangshanian																489.5
														Aksaian				490.7 *
														Sakian				492.2 *
							Steptoean											493 *
										Maentwrogian								493.1 *
		Paibian																494
		Paibian														Ensyan †/Maduan/Nganasanian		494.7 *
	Miaolingian	Guzhangian					Marjumian	Albertian †	St Davids					Ayusokkanian			Middle Cambrian	497
		Guzhangian												Mayan/Menevian				499.5
		Drumian												Mayan/Menevian				500.5
		Wuliuan					Topazan							Amgan/Solvan				504.5
		Wuliuan					Delamaran											506.5
	Series 2	Stage 4						Waucoban †	Caerfai								Early Cambrian	509
														Toyonian	Lenian †			510 *
							Dyeran							Toyonian				511 *
														Botomian				512.5 *
		Stage 3																514
							Montezuman											514.8 *
							Montezuman							Atdabanian				515.6 *
							Begadean							Atdabanian				519.9 *
	Terreneuvian	Stage 2												Tommotian				521
		Stage 2												Nemakit-Daldynian				525.5
		Fortunian												Nemakit-Daldynian	Manykaian †			529
																		538.8