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		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				Batyrbaian	Tavgian †	Ketyan †/Yurakian	Late Cambrian	485.4
		Stage 10					Sunwaptan									487.5
		Jiangshanian														489.5
												Aksaian				490.7 *
												Sakian				492.2 *
							Steptoean									493 *
		Paibian														494
		Paibian												Ensyan †/Maduan/Nganasanian		494.7 *
	Miaolingian	Guzhangian					Marjumian	Albertian †				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 †							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