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 China		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					Niuchehean	Taoyuanian †				Merioneth	Dolgellian/Trempealeauan	Batyrbaian		Franconian †/Dresbachian/Millardan	Late Cambrian	485.4
													Dolgellian/Trempealeauan		Sunwaptan			487.5
													Festiniogian					489.2 *
		Jiangshanian					Jiangshanian											489.5
														Aksaian				490.7 *
														Sakian				492.2 *
															Steptoean			493 *
													Maentwrogian					493.1 *
		Paibian					Paibian											494
		Paibian					Paibian	Waergangian †/Youshuanian										494.9 *
	Miaolingian	Guzhangian					Guzhangian	Wangcunian †				St Davids		Ayusokkanian	Marjumian	Albertian †	Middle Cambrian	497
		Guzhangian					Guzhangian											499.5
		Drumian					Drumian							Zhanaarykian				500.5
		Drumian					Drumian							Tuesaian				503
		Wuliuan					Wuliuan/Taijangian							Tuesaian	Topazan			504.5
															Topazan			505.3
															Delamaran			506.5
	Series 2	Stage 4					Duyunian					Caerfai				Waucoban †	Early Cambrian	509
														Toyonian				510 *
														Toyonian	Dyeran			511 *
														Botomian				512.5 *
		Stage 3					Nangaoian											514
															Montezuman			514.8 *
														Atdabanian	Montezuman			515.6 *
														Atdabanian	Begadean			519.9 *
	Terreneuvian	Stage 2					Meishucunian							Tommotian				521
		Stage 2																525.5
		Fortunian																529
		Fortunian					Jinnigian											530.7
																		538.8