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						Ordovician of China			Cambrian of China		Cambrian of Australia	Ordovician of Ibero-Bohemia				Cambrian of North America		Cambrian Epochs
Ordovician	Late Ordovician	Hirnantian	Ashgill	Hirnantian			Cincinnatian	Gamachian					Hirnantian	Xiaoxita †/Shikou	Wufeng †				Kosovian							443.8
		Katian		Rawtheyan				Gamachian					Chientangkiangian						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					Ibexian	Blackhillsian		Jeffersonian †	Cassinian †		Yiyangian													470
				Whitlandian				Blackhillsian																		471.1 *
				Whitlandian				Tulean																		473.9 *
				Moridunian																						474.3 *
		Tremadocian	Tremadoc	Migneintian									Xinchangian						Tremadocian							477.7
															Lianghekou †											477.9 *
								Stairsian																		480.3 *
				Cressagian				Stairsian																		480.8 *
				Cressagian				Skullrockian			Demingian †															482 *
											Demingian †															485 *
Cambrian	Furongian	Stage 10														Niuchehean	Taoyuanian †	Datsonian						Franconian †/Dresbachian/Millardan	Late Cambrian	485.4
																		Payntonian								486.8 *
																		Payntonian					Sunwaptan			487.5
		Jiangshanian														Jiangshanian		Iverian					Sunwaptan			489.5
		Jiangshanian														Jiangshanian		Iverian					Steptoean			493 *
		Paibian														Paibian		Idamean								494
		Paibian														Paibian	Waergangian †/Youshuanian	Idamean								494.9 *
	Miaolingian	Guzhangian														Guzhangian	Wangcunian †	Mindyallan					Marjumian	Albertian †	Middle Cambrian	497
		Guzhangian														Guzhangian		Boomerangian								499
		Drumian														Drumian		Undillan								500.5
		Drumian														Drumian		Floran								503
		Wuliuan														Wuliuan/Taijangian		Templetonian					Topazan			504.5
																		Templetonian					Delamaran			506.5
																		Ordian								507.8 *
	Series 2	Stage 4														Duyunian		Ordian						Waucoban †	Early Cambrian	509
																										510.8 *
																							Dyeran			511 *
		Stage 3														Nangaoian							Dyeran			514
																							Montezuman			514.8 *
																							Begadean			519.9 *
	Terreneuvian	Stage 2														Meishucunian										521
		Fortunian										529				Meishucunian
		Fortunian										Jinnigian				530.7
																										538.8