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				Cambrian of Britain		Ordovician of China			Ordovician of Ibero-Bohemia				Ordovician of North America						Ordovician of Australia	Cambrian of North America		Cambrian Epochs
Ordovician	Late Ordovician	Hirnantian	Ashgill	Hirnantian					Hirnantian	Xiaoxita †/Shikou	Wufeng †	Kosovian				Cincinnatian	Gamachian					Bolindian				443.8
		Katian		Rawtheyan					Chientangkiangian			Kralodvorian	Bohdalec †				Gamachian									445.2
				Rawtheyan													Richmondian									446 *
				Cautleyan																						448.9 *
				Cautleyan																		Eastonian				449 *
				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 *
				Cheneyan																		Gisbornian				452 *
				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												Darriwilian				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 †									Yapeenian				467.3
												Arenigian														468
			Arenig	Fennian																						468.4 *
																						Castlemainian				468.5 *
																	Rangerian					Castlemainian				469.1 *
	Early Ordovician	Floian							Yiyangian							Ibexian	Blackhillsian		Jeffersonian †	Cassinian †		Chewtonian				470
				Whitlandian																		Chewtonian				471.1 *
																						Bendigonian				471.8 *
																						Lancefieldian				473.5 *
																	Tulean									473.9 *
				Moridunian																						474.3 *
		Tremadocian	Tremadoc	Migneintian					Xinchangian			Tremadocian														477.7
											Lianghekou †															477.9 *
																	Stairsian									480.3 *
				Cressagian													Stairsian									480.8 *
																	Skullrockian			Demingian †						482 *
																						Warendian				482.8 *
																						Warendian				485 *
Cambrian	Furongian	Stage 10					Merioneth	Dolgellian/Trempealeauan																Franconian †/Dresbachian/Millardan	Late Cambrian	485.4
								Dolgellian/Trempealeauan															Sunwaptan			487.5
								Festiniogian																		489.2 *
		Jiangshanian																								489.5
																							Steptoean			493 *
								Maentwrogian																		493.1 *
		Paibian						Maentwrogian																		494
	Miaolingian	Guzhangian					St Davids																Marjumian	Albertian †	Middle Cambrian	497
		Drumian																					Marjumian			500.5
		Wuliuan																					Topazan			504.5
		Wuliuan																					Delamaran			506.5
	Series 2	Stage 4					Caerfai																Delamaran	Waucoban †	Early Cambrian	509
		Stage 4																					Dyeran			511 *
		Stage 3																					Dyeran			514
																							Montezuman			514.8 *
																					Begadean		519.9 *
	Terreneuvian	Stage 2																					521
	Terreneuvian	Fortunian																					529
																										538.8