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 4548 collections

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International Chronostratigraphic Timescale			Ordovician of Britain				Ordovician of China			Cambrian of Britain		Ordovician of North America						Cambrian of Kazakhstan	Cambrian of China		Ordovician of Ibero-Bohemia				Cambrian of North America		Cambrian Epochs
Ordovician	Late Ordovician	Hirnantian	Ashgill	Hirnantian			Hirnantian	Xiaoxita †/Shikou	Wufeng †			Cincinnatian	Gamachian								Kosovian							443.8
		Katian		Rawtheyan			Chientangkiangian						Gamachian								Kralodvorian	Bohdalec †						445.2
				Rawtheyan									Richmondian															446 *
				Cautleyan																								448.9 *
				Pusgillian																								449.3 *
				Pusgillian			Neichianshanian/Hanjiang																					449.5
			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			Darriwilian	Guniu †/Hulo																				458.4
																					Dobrotivian							458.5 *
																					Oretanian							459.7 *
				Abereiddian/Early Llanvirn																								461.3 *
																						Sarka †						461.7 *
								Hunjiang †	Dawan †/Daobaowan/Ningkuo													Sarka †						466.3 *
		Dapingian					Dapingian															Klabava †						467.3
																					Arenigian							468
			Arenig	Fennian																								468.4 *
													Rangerian															469.1 *
	Early Ordovician	Floian					Yiyangian					Ibexian	Blackhillsian		Jeffersonian †	Cassinian †												470
				Whitlandian									Blackhillsian															471.1 *
				Whitlandian									Tulean															473.9 *
				Moridunian																								474.3 *
		Tremadocian	Tremadoc	Migneintian			Xinchangian											Ungurian			Tremadocian							477.7
									Lianghekou †																			477.9 *
													Stairsian															480.3 *
				Cressagian									Stairsian															480.8 *
				Cressagian									Skullrockian			Demingian †												482 *
																Demingian †												485 *
Cambrian	Furongian	Stage 10								Merioneth	Dolgellian/Trempealeauan							Batyrbaian	Niuchehean	Taoyuanian †						Franconian †/Dresbachian/Millardan	Late Cambrian	485.4
											Dolgellian/Trempealeauan														Sunwaptan			487.5
											Festiniogian																	489.2 *
		Jiangshanian																	Jiangshanian									489.5
																		Aksaian										490.7 *
																		Sakian										492.2 *
																									Steptoean			493 *
											Maentwrogian																	493.1 *
		Paibian																	Paibian									494
		Paibian																	Paibian	Waergangian †/Youshuanian								494.9 *
	Miaolingian	Guzhangian								St Davids								Ayusokkanian	Guzhangian	Wangcunian †					Marjumian	Albertian †	Middle Cambrian	497
		Guzhangian																	Guzhangian									499.5
		Drumian																Zhanaarykian	Drumian									500.5
		Drumian																Tuesaian	Drumian									503
		Wuliuan																Tuesaian	Wuliuan/Taijangian						Topazan			504.5
																									Topazan			505.3
																									Delamaran			506.5
	Series 2	Stage 4								Caerfai									Duyunian							Waucoban †	Early Cambrian	509
																		Toyonian										510 *
																		Toyonian							Dyeran			511 *
																		Botomian										512.5 *
		Stage 3															Nangaoian		514
																			Montezuman						514.8 *
																		Atdabanian	Montezuman						515.6 *
																		Atdabanian	Begadean						519.9 *
	Terreneuvian	Stage 2															Tommotian	Meishucunian							521
		Stage 2																							525.5
		Fortunian																							529
		Fortunian																Jinnigian							530.7
																												538.8