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				Cambrian of Australia	Cambrian of China		Cambrian Epochs
Ordovician	Late Ordovician	Hirnantian	Ashgill	Hirnantian							443.8
		Katian		Rawtheyan							445.2
				Cautleyan							448.9 *
				Pusgillian							449.3 *
			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							458.4
		Darriwilian		Abereiddian/Early Llanvirn							461.3 *
		Dapingian		Abereiddian/Early Llanvirn							467.3
		Dapingian	Arenig	Fennian							468.4 *
	Early Ordovician	Floian		Fennian							470
				Whitlandian							471.1 *
				Moridunian							474.3 *
		Tremadocian	Tremadoc	Migneintian							477.7
			Tremadoc	Cressagian							480.8 *
											485 *
Cambrian	Furongian	Stage 10					Datsonian	Niuchehean	Taoyuanian †	Late Cambrian	485.4
		Stage 10					Payntonian	Niuchehean			486.8 *
		Jiangshanian					Iverian	Jiangshanian			489.5
		Paibian					Idamean	Paibian			494
		Paibian					Idamean	Paibian	Waergangian †/Youshuanian		494.9 *
	Miaolingian	Guzhangian					Mindyallan	Guzhangian	Wangcunian †	Middle Cambrian	497
		Guzhangian					Boomerangian	Guzhangian			499
		Drumian					Undillan	Drumian			500.5
		Drumian					Floran	Drumian			503
		Wuliuan					Templetonian	Wuliuan/Taijangian			504.5
		Wuliuan					Ordian	Wuliuan/Taijangian			507.8 *
	Series 2	Stage 4					Ordian	Duyunian		Early Cambrian	509
		Stage 4						Duyunian			510.8 *
		Stage 3						Nangaoian			514
	Terreneuvian	Stage 2						Meishucunian			521
		Fortunian						Meishucunian			529
		Fortunian						Jinnigian			530.7
											538.8