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 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				477.7
				Migneintian						Lianghekou †		477.9 *
				Cressagian								480.8 *
												485 *
Cambrian	Furongian	Stage 10					Datsonian				Late Cambrian	485.4
		Stage 10					Payntonian					486.8 *
		Jiangshanian					Iverian					489.5
		Paibian					Idamean					494
	Miaolingian	Guzhangian					Mindyallan				Middle Cambrian	497
		Guzhangian					Boomerangian					499
		Drumian					Undillan					500.5
		Drumian					Floran					503
		Wuliuan					Templetonian					504.5
		Wuliuan					Ordian					507.8 *
	Series 2	Stage 4					Ordian				Early Cambrian	509
		Stage 4										510.8 *
		Stage 3										514
	Terreneuvian	Stage 2										521
	Terreneuvian	Fortunian										529
												538.8