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 4548 collections

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International Chronostratigraphic Timescale			Ordovician of Britain				Cambrian of Kazakhstan	Ordovician of China			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			Ungurian	Xinchangian				477.7
				Migneintian						Lianghekou †		477.9 *
				Cressagian								480.8 *
												485 *
Cambrian	Furongian	Stage 10					Batyrbaian				Late Cambrian	485.4
		Jiangshanian					Batyrbaian					489.5
							Aksaian					490.7 *
							Sakian					492.2 *
		Paibian					Sakian					494
	Miaolingian	Guzhangian					Ayusokkanian				Middle Cambrian	497
		Guzhangian										499.5
		Drumian					Zhanaarykian					500.5
		Drumian					Tuesaian					503
		Wuliuan					Tuesaian					504.5
		Wuliuan										505.3
	Series 2	Stage 4									Early Cambrian	509
							Toyonian					510 *
							Botomian					512.5 *
		Stage 3					Botomian					514
		Stage 3					Atdabanian					515.6 *
	Terreneuvian	Stage 2					Tommotian					521
		Stage 2										525.5
		Fortunian										529
												538.8