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		Cambrian of Kazakhstan	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					Ungurian		477.7
			Tremadoc	Cressagian							480.8 *
											485 *
Cambrian	Furongian	Stage 10					Niuchehean	Taoyuanian †	Batyrbaian	Late Cambrian	485.4
		Jiangshanian					Jiangshanian		Batyrbaian		489.5
									Aksaian		490.7 *
									Sakian		492.2 *
		Paibian					Paibian				494
		Paibian					Paibian	Waergangian †/Youshuanian			494.9 *
	Miaolingian	Guzhangian					Guzhangian	Wangcunian †	Ayusokkanian	Middle Cambrian	497
		Guzhangian					Guzhangian				499.5
		Drumian					Drumian		Zhanaarykian		500.5
		Drumian					Drumian		Tuesaian		503
		Wuliuan					Wuliuan/Taijangian		Tuesaian		504.5
		Wuliuan					Wuliuan/Taijangian				505.3
	Series 2	Stage 4					Duyunian			Early Cambrian	509
									Toyonian		510 *
									Botomian		512.5 *
		Stage 3					Nangaoian		Botomian		514
		Stage 3					Nangaoian		Atdabanian		515.6 *
	Terreneuvian	Stage 2					Meishucunian		Tommotian		521
		Stage 2									525.5
		Fortunian									529
		Fortunian					Jinnigian				530.7
											538.8