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
D. H. Erwin and S. A. Bowring. 2004. Cambrian time scale. 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					Cambrian of Siberia			Cambrian of Kazakhstan	Cambrian of North America		Cambrian Epochs
Ordovician	Late Ordovician	Hirnantian	Ashgill	Hirnantian					Cincinnatian	Gamachian											443.8
		Katian		Rawtheyan						Gamachian											445.2
				Rawtheyan						Richmondian											446 *
				Cautleyan																	448.9 *
				Pusgillian																	449.3 *
			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																	458.4
		Darriwilian		Abereiddian/Early Llanvirn																	461.3 *
		Dapingian		Abereiddian/Early Llanvirn																	467.3
			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													Ungurian				477.7
				Migneintian						Stairsian											480.3 *
				Cressagian						Stairsian											480.8 *
										Skullrockian			Demingian †								482 *
														Mansian †							483.55 *
														Mansian †							485 *
Cambrian	Furongian	Stage 10					Niuchehean	Taoyuanian †						Batyrbaian	Tavgian †	Ketyan †/Yurakian	Batyrbaian		Franconian †/Dresbachian/Millardan	Late Cambrian	485.4
		Stage 10					Niuchehean											Sunwaptan			487.5
		Jiangshanian					Jiangshanian														489.5
														Aksaian			Aksaian				490.7 *
														Sakian			Sakian				492.2 *
																		Steptoean			493 *
		Paibian					Paibian														494
																Ensyan †/Maduan/Nganasanian					494.7 *
								Waergangian †/Youshuanian								Ensyan †/Maduan/Nganasanian					494.9 *
	Miaolingian	Guzhangian					Guzhangian	Wangcunian †						Ayusokkanian			Ayusokkanian	Marjumian	Albertian †	Middle Cambrian	497
		Guzhangian					Guzhangian							Mayan/Menevian							499.5
		Drumian					Drumian										Zhanaarykian				500.5
		Drumian					Drumian										Tuesaian				503
		Wuliuan					Wuliuan/Taijangian							Amgan/Solvan			Tuesaian	Topazan			504.5
																		Topazan			505.3
																		Delamaran			506.5
	Series 2	Stage 4					Duyunian												Waucoban †	Early Cambrian	509
														Toyonian	Lenian †		Toyonian				510 *
														Toyonian			Toyonian	Dyeran			511 *
														Botomian			Botomian				512.5 *
		Stage 3					Nangaoian														514
																		Montezuman			514.8 *
														Atdabanian			Atdabanian	Montezuman			515.6 *
														Atdabanian			Atdabanian	Begadean			519.9 *
	Terreneuvian	Stage 2					Meishucunian							Tommotian			Tommotian				521
		Stage 2												Nemakit-Daldynian							525.5
		Fortunian													Manykaian †						529
		Fortunian					Jinnigian								Manykaian †						530.7
																					538.8