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
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

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				Cambrian of China		Ordovician of North America					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