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
D. H. Erwin and S. A. Bowring. 2004. Cambrian time scale. 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 China			Ordovician of North America					Cambrian of Siberia			Cambrian of Kazakhstan	Cambrian of North America		Cambrian Epochs
Ordovician	Late Ordovician	Hirnantian	Ashgill	Hirnantian			Hirnantian	Xiaoxita †/Shikou	Wufeng †	Cincinnatian	Gamachian											443.8
		Katian		Rawtheyan			Chientangkiangian				Gamachian											445.2
				Rawtheyan							Richmondian											446 *
				Cautleyan																		448.9 *
				Pusgillian																		449.3 *
				Pusgillian			Neichianshanian/Hanjiang															449.5
			Caradoc	Streffordian	Onnian †																	449.6 *
											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 *
				Aurelucian																		456.8 *
										Whiterockian		Canadian †	Chazyan †/Marmor									457 *
					Soudleyan †/Harnagian/Costonian																	457.4 *
	Middle Ordovician	Darriwilian	Llanvirn	Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn			Darriwilian	Guniu †/Hulo														458.4
				Abereiddian/Early Llanvirn				Guniu †/Hulo														461.3 *
								Hunjiang †	Dawan †/Daobaowan/Ningkuo													466.3 *
		Dapingian					Dapingian															467.3
			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				477.7
									Lianghekou †													477.9 *
											Stairsian											480.3 *
				Cressagian							Stairsian											480.8 *
											Skullrockian			Demingian †								482 *
															Mansian †							483.55 *
															Mansian †							485 *
Cambrian	Furongian	Stage 10													Batyrbaian	Tavgian †	Ketyan †/Yurakian	Batyrbaian		Franconian †/Dresbachian/Millardan	Late Cambrian	485.4
		Stage 10																	Sunwaptan			487.5
		Jiangshanian																				489.5
															Aksaian			Aksaian				490.7 *
															Sakian			Sakian				492.2 *
																			Steptoean			493 *
		Paibian																				494
		Paibian															Ensyan †/Maduan/Nganasanian					494.7 *
	Miaolingian	Guzhangian													Ayusokkanian			Ayusokkanian	Marjumian	Albertian †	Middle Cambrian	497
		Guzhangian													Mayan/Menevian							499.5
		Drumian																Zhanaarykian				500.5
		Drumian																Tuesaian				503
		Wuliuan													Amgan/Solvan			Tuesaian	Topazan			504.5
																			Topazan			505.3
																			Delamaran			506.5
	Series 2	Stage 4																		Waucoban †	Early Cambrian	509
															Toyonian	Lenian †		Toyonian				510 *
															Toyonian			Toyonian	Dyeran			511 *
															Botomian			Botomian				512.5 *
		Stage 3																				514
																			Montezuman			514.8 *
															Atdabanian			Atdabanian	Montezuman			515.6 *
															Atdabanian			Atdabanian	Begadean			519.9 *
	Terreneuvian	Stage 2													Tommotian			Tommotian				521
		Stage 2													Nemakit-Daldynian							525.5
		Fortunian													Nemakit-Daldynian	Manykaian †						529
																						538.8