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
D. H. Erwin and S. A. Bowring. 2004. Cambrian time scale. 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				Ordovician of North America					Cambrian of Siberia			Cambrian Epochs
Ordovician	Late Ordovician	Hirnantian	Ashgill	Hirnantian			Cincinnatian	Gamachian								443.8
		Katian		Rawtheyan				Gamachian								445.2
				Rawtheyan				Richmondian								446 *
				Cautleyan												448.9 *
				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 *
				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												458.4
		Darriwilian		Abereiddian/Early Llanvirn												461.3 *
		Dapingian		Abereiddian/Early Llanvirn												467.3
			Arenig	Fennian												468.4 *
								Rangerian								469.1 *
	Early Ordovician	Floian					Ibexian	Blackhillsian		Jeffersonian †	Cassinian †					470
				Whitlandian				Blackhillsian								471.1 *
				Whitlandian				Tulean								473.9 *
				Moridunian												474.3 *
		Tremadocian	Tremadoc	Migneintian												477.7
				Migneintian				Stairsian								480.3 *
				Cressagian				Stairsian								480.8 *
								Skullrockian			Demingian †					482 *
												Mansian †				483.55 *
												Mansian †				485 *
Cambrian	Furongian	Stage 10										Batyrbaian	Tavgian †	Ketyan †/Yurakian	Late Cambrian	485.4
		Stage 10														487.5
		Jiangshanian														489.5
												Aksaian				490.7 *
												Sakian				492.2 *
		Paibian														494
		Paibian												Ensyan †/Maduan/Nganasanian		494.7 *
	Miaolingian	Guzhangian										Ayusokkanian			Middle Cambrian	497
		Guzhangian										Mayan/Menevian				499.5
		Drumian										Mayan/Menevian				500.5
		Wuliuan										Amgan/Solvan				504.5
	Series 2	Stage 4										Amgan/Solvan			Early Cambrian	509
												Toyonian	Lenian †			510 *
												Botomian				512.5 *
		Stage 3										Botomian				514
		Stage 3										Atdabanian				515.6 *
	Terreneuvian	Stage 2										Tommotian				521
		Stage 2										Nemakit-Daldynian				525.5
		Fortunian										Nemakit-Daldynian	Manykaian †			529
																538.8