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 Ibero-Bohemia				Ordovician of North America						Cambrian of Siberia			Cambrian of Kazakhstan	Cambrian of North America		Cambrian Epochs
Ordovician	Late Ordovician	Hirnantian	Ashgill	Hirnantian			Kosovian				Cincinnatian	Gamachian												443.8
		Katian		Rawtheyan			Kralodvorian	Bohdalec †				Gamachian												445.2
				Rawtheyan								Richmondian												446 *
				Cautleyan																				448.9 *
				Pusgillian																				449.3 *
			Caradoc	Streffordian	Onnian †																			449.6 *
							Berounian																	449.7 *
												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 *
									Zahorany †/Vinice	Letna †														456.2 *
				Aurelucian																				456.8 *
											Whiterockian		Canadian †	Chazyan †/Marmor										457 *
					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 *
												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			Tremadocian													Ungurian				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	Batyrbaian		Franconian †/Dresbachian/Millardan	Late Cambrian	485.4
		Stage 10																			Sunwaptan			487.5
		Jiangshanian																						489.5
																	Aksaian			Aksaian				490.7 *
																	Sakian			Sakian				492.2 *
																					Steptoean			493 *
		Paibian																						494
		Paibian																	Ensyan †/Maduan/Nganasanian					494.7 *
	Miaolingian	Guzhangian															Ayusokkanian			Ayusokkanian	Marjumian	Albertian †	Middle Cambrian	497
		Guzhangian															Mayan/Menevian							499.5
		Drumian																		Zhanaarykian				500.5
		Drumian																		Tuesaian				503
		Wuliuan															Amgan/Solvan			Tuesaian	Topazan			504.5
																					Topazan			505.3
																					Delamaran			506.5
	Series 2	Stage 4																				Waucoban †	Early Cambrian	509
																	Toyonian	Lenian †		Toyonian				510 *
																	Toyonian			Toyonian	Dyeran			511 *
																	Botomian			Botomian				512.5 *
		Stage 3																						514
																					Montezuman			514.8 *
																	Atdabanian			Atdabanian	Montezuman			515.6 *
																	Atdabanian			Atdabanian	Begadean			519.9 *
	Terreneuvian	Stage 2														Tommotian	Tommotian			521
		Stage 2														Nemakit-Daldynian				525.5
		Fortunian														Nemakit-Daldynian		Manykaian †		529
																								538.8