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
M. Kretzoi. 1942. Necroteuthis n. g. (Ceph. Dibr., Necroteuthidae N. F.) aus dem Oligozän von Budapest und das system der Dibranchiata. Földtani Közlöny 72:125-238 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				Ordovician of North America					Cambrian Epochs	Ordovician of Australia
Ordovician	Late Ordovician	Hirnantian	Ashgill	Hirnantian			Cincinnatian	Gamachian					Bolindian	443.8
		Katian		Rawtheyan				Gamachian						445.2
				Rawtheyan				Richmondian						446 *
				Cautleyan										448.9 *
				Cautleyan									Eastonian	449 *
				Pusgillian										449.3 *
			Caradoc	Streffordian	Onnian †									449.6 *
								Maysvillian	Rocklandian †/Shermanian/Ashbyan/Kirkfieldian/Blackriveran/Wildernessian/Trentonian/Franklinian					449.8 *
								Edenian						450.4 *
							Mohawkian	Chatfieldian						451.1 *
				Cheneyan										451.5 *
				Cheneyan									Gisbornian	452 *
				Burrellian										452.7 *
		Sandbian												453
					Actonian †									453.2 *
					Actonian †			Turinian						453.7 *
					Marshbrookian †	Woolstonian †								454.2 *
					Longvillian †									455.2 *
				Aurelucian										456.8 *
							Whiterockian		Canadian †	Chazyan †/Marmor				457 *
					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 *
								Rangerian					Castlemainian	469.1 *
	Early Ordovician	Floian					Ibexian	Blackhillsian		Jeffersonian †	Cassinian †		Chewtonian	470
				Whitlandian									Chewtonian	471.1 *
													Bendigonian	471.8 *
													Lancefieldian	473.5 *
								Tulean						473.9 *
				Moridunian										474.3 *
		Tremadocian	Tremadoc	Migneintian										477.7
				Migneintian				Stairsian						480.3 *
				Cressagian				Stairsian						480.8 *
								Skullrockian			Demingian †			482 *
													Warendian	482.8 *
													Warendian	485 *
Cambrian	Furongian	Stage 10										Late Cambrian		485.4
		Stage 10												487.5
		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