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 4546 collections

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International Chronostratigraphic Timescale			Ordovician of Britain				Cambrian of North America		Cambrian of Siberia			Cambrian Epochs
Ordovician	Late Ordovician	Hirnantian	Ashgill	Hirnantian									443.8
		Katian		Rawtheyan									445.2
				Cautleyan									448.9 *
				Pusgillian									449.3 *
			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									458.4
		Darriwilian		Abereiddian/Early Llanvirn									461.3 *
		Dapingian		Abereiddian/Early Llanvirn									467.3
		Dapingian	Arenig	Fennian									468.4 *
	Early Ordovician	Floian		Fennian									470
				Whitlandian									471.1 *
				Moridunian									474.3 *
		Tremadocian	Tremadoc	Migneintian									477.7
				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