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

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	Ordovician of China			Cambrian of Britain		Cambrian of Kazakhstan	Cambrian of North America		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					Ungurian				477.7
				Migneintian						Lianghekou †							477.9 *
				Cressagian													480.8 *
																	485 *
Cambrian	Furongian	Stage 10					Datsonian				Merioneth	Dolgellian/Trempealeauan	Batyrbaian		Franconian †/Dresbachian/Millardan	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					Maentwrogian					494
	Miaolingian	Guzhangian					Mindyallan				St Davids		Ayusokkanian	Marjumian	Albertian †	Middle Cambrian	497
							Boomerangian						Ayusokkanian				499
							Boomerangian										499.5
		Drumian					Undillan						Zhanaarykian				500.5
		Drumian					Floran						Tuesaian				503
		Wuliuan					Templetonian						Tuesaian	Topazan			504.5
														Topazan			505.3
														Delamaran			506.5
							Ordian										507.8 *
	Series 2	Stage 4									Caerfai				Waucoban †	Early Cambrian	509
													Toyonian				510 *
																	510.8 *
														Dyeran			511 *
													Botomian				512.5 *
		Stage 3															514
														Montezuman			514.8 *
													Atdabanian	Montezuman			515.6 *
													Atdabanian	Begadean			519.9 *
	Terreneuvian	Stage 2											Tommotian				521
		Stage 2															525.5
		Fortunian															529
																	538.8