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 Australia	Cambrian Epochs
Ordovician	Late Ordovician	Hirnantian	Ashgill	Hirnantian					Bolindian		443.8
		Katian		Rawtheyan							445.2
				Cautleyan							448.9 *
				Cautleyan					Eastonian		449 *
				Pusgillian							449.3 *
			Caradoc	Streffordian	Onnian †						449.6 *
				Cheneyan							451.5 *
				Cheneyan					Gisbornian		452 *
				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		458.4
		Darriwilian		Abereiddian/Early Llanvirn					Darriwilian		461.3 *
		Dapingian		Abereiddian/Early Llanvirn					Yapeenian		467.3
			Arenig	Fennian					Yapeenian		468.4 *
									Castlemainian		468.5 *
	Early Ordovician	Floian							Chewtonian		470
				Whitlandian					Chewtonian		471.1 *
									Bendigonian		471.8 *
									Lancefieldian		473.5 *
				Moridunian							474.3 *
		Tremadocian	Tremadoc	Migneintian							477.7
				Cressagian							480.8 *
				Cressagian					Warendian		482.8 *
									Warendian		485 *
Cambrian	Furongian	Stage 10					Niuchehean	Taoyuanian †		Late Cambrian	485.4
		Jiangshanian					Jiangshanian				489.5
		Paibian					Paibian				494
		Paibian					Paibian	Waergangian †/Youshuanian			494.9 *
	Miaolingian	Guzhangian					Guzhangian	Wangcunian †		Middle Cambrian	497
		Drumian					Drumian	Wangcunian †			500.5
		Wuliuan					Wuliuan/Taijangian				504.5
	Series 2	Stage 4					Duyunian			Early Cambrian	509
	Series 2	Stage 3					Nangaoian				514
	Terreneuvian	Stage 2					Meishucunian				521
		Fortunian					Meishucunian				529
		Fortunian					Jinnigian				530.7
											538.8