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

Show more time

Show linear time

International Chronostratigraphic Timescale			Ordovician of Britain				Cambrian Epochs	Cambrian of Kazakhstan	Cambrian of China		Ordovician of Ibero-Bohemia				Cambrian of North America
Ordovician	Late Ordovician	Hirnantian	Ashgill	Hirnantian							Kosovian						443.8
		Katian		Rawtheyan							Kralodvorian	Bohdalec †					445.2
				Cautleyan													448.9 *
				Pusgillian													449.3 *
			Caradoc	Streffordian	Onnian †												449.6 *
				Streffordian							Berounian						449.7 *
				Cheneyan													451.5 *
				Burrellian													452.7 *
		Sandbian															453
					Actonian †												453.2 *
					Marshbrookian †	Woolstonian †											454.2 *
					Longvillian †												455.2 *
													Zahorany †/Vinice	Letna †			456.2 *
				Aurelucian													456.8 *
					Soudleyan †/Harnagian/Costonian												457.4 *
					Soudleyan †/Harnagian/Costonian							Liben †					458 *
	Middle Ordovician	Darriwilian	Llanvirn	Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn													458.4
											Dobrotivian						458.5 *
											Oretanian						459.7 *
				Abereiddian/Early Llanvirn													461.3 *
												Sarka †					461.7 *
		Dapingian										Klabava †					467.3
											Arenigian						468
			Arenig	Fennian													468.4 *
	Early Ordovician	Floian		Fennian													470
				Whitlandian													471.1 *
				Moridunian													474.3 *
		Tremadocian	Tremadoc	Migneintian				Ungurian			Tremadocian						477.7
			Tremadoc	Cressagian													480.8 *
																	485 *
Cambrian	Furongian	Stage 10					Late Cambrian	Batyrbaian	Niuchehean	Taoyuanian †						Franconian †/Dresbachian/Millardan	485.4
		Stage 10							Niuchehean						Sunwaptan		487.5
		Jiangshanian							Jiangshanian								489.5
								Aksaian									490.7 *
								Sakian									492.2 *
															Steptoean		493 *
		Paibian							Paibian								494
		Paibian							Paibian	Waergangian †/Youshuanian							494.9 *
	Miaolingian	Guzhangian					Middle Cambrian	Ayusokkanian	Guzhangian	Wangcunian †					Marjumian	Albertian †	497
		Guzhangian							Guzhangian								499.5
		Drumian						Zhanaarykian	Drumian								500.5
		Drumian						Tuesaian	Drumian								503
		Wuliuan						Tuesaian	Wuliuan/Taijangian						Topazan		504.5
															Topazan		505.3
															Delamaran		506.5
	Series 2	Stage 4					Early Cambrian		Duyunian							Waucoban †	509
								Toyonian									510 *
								Toyonian							Dyeran		511 *
								Botomian									512.5 *
		Stage 3							Nangaoian								514
															Montezuman		514.8 *
								Atdabanian							Montezuman		515.6 *
								Atdabanian							Begadean		519.9 *
	Terreneuvian	Stage 2						Tommotian	Meishucunian								521
		Stage 2															525.5
		Fortunian															529
		Fortunian							Jinnigian								530.7
																	538.8