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 Australia	Cambrian 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					Datsonian	Merioneth	Dolgellian/Trempealeauan		Franconian †/Dresbachian/Millardan	Batyrbaian	Tavgian †	Ketyan †/Yurakian	Late Cambrian	485.4
							Payntonian									486.8 *
										Sunwaptan						487.5
									Festiniogian							489.2 *
		Jiangshanian					Iverian									489.5
												Aksaian				490.7 *
												Sakian				492.2 *
										Steptoean						493 *
									Maentwrogian							493.1 *
		Paibian					Idamean									494
		Paibian					Idamean							Ensyan †/Maduan/Nganasanian		494.7 *
	Miaolingian	Guzhangian					Mindyallan	St Davids		Marjumian	Albertian †	Ayusokkanian			Middle Cambrian	497
							Boomerangian					Ayusokkanian				499
							Boomerangian					Mayan/Menevian				499.5
		Drumian					Undillan									500.5
		Drumian					Floran									503
		Wuliuan					Templetonian			Topazan		Amgan/Solvan				504.5
							Templetonian			Delamaran						506.5
							Ordian									507.8 *
	Series 2	Stage 4						Caerfai			Waucoban †				Early Cambrian	509
												Toyonian	Lenian †			510 *
																510.8 *
										Dyeran						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