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

Show more time

Show linear time

International Chronostratigraphic Timescale			Ordovician of Britain				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						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