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

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International Chronostratigraphic Timescale			Ordovician of Britain				Ordovician of North America					Cambrian of China		Ordovician of Ibero-Bohemia				Cambrian of North America		Cambrian Epochs
Ordovician	Late Ordovician	Hirnantian	Ashgill	Hirnantian			Cincinnatian	Gamachian						Kosovian							443.8
		Katian		Rawtheyan				Gamachian						Kralodvorian	Bohdalec †						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							477.7
				Migneintian				Stairsian													480.3 *
				Cressagian				Stairsian													480.8 *
				Cressagian				Skullrockian			Demingian †										482 *
											Demingian †										485 *
Cambrian	Furongian	Stage 10										Niuchehean	Taoyuanian †						Franconian †/Dresbachian/Millardan	Late Cambrian	485.4
		Stage 10										Niuchehean						Sunwaptan			487.5
		Jiangshanian										Jiangshanian						Sunwaptan			489.5
		Jiangshanian										Jiangshanian						Steptoean			493 *
		Paibian										Paibian									494
		Paibian										Paibian	Waergangian †/Youshuanian								494.9 *
	Miaolingian	Guzhangian										Guzhangian	Wangcunian †					Marjumian	Albertian †	Middle Cambrian	497
		Drumian										Drumian	Wangcunian †					Marjumian			500.5
		Wuliuan										Wuliuan/Taijangian						Topazan			504.5
		Wuliuan										Wuliuan/Taijangian						Delamaran			506.5
	Series 2	Stage 4										Duyunian						Delamaran	Waucoban †	Early Cambrian	509
		Stage 4										Duyunian						Dyeran			511 *
		Stage 3										Nangaoian						Dyeran			514
																		Montezuman			514.8 *
																		Begadean			519.9 *
	Terreneuvian	Stage 2										Meishucunian									521
		Fortunian										Meishucunian									529
		Fortunian										Jinnigian									530.7
																					538.8