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 4546 collections

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International Chronostratigraphic Timescale			Ordovician of Britain				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								Late Cambrian	485.4
		Jiangshanian									489.5
		Paibian									494
	Miaolingian	Guzhangian								Middle Cambrian	497
		Drumian									500.5
		Wuliuan									504.5
	Series 2	Stage 4								Early Cambrian	509
	Series 2	Stage 3									514
	Terreneuvian	Stage 2									521
	Terreneuvian	Fortunian									529
											538.8