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					Cambrian of China		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													477.7
				Migneintian				Stairsian									480.3 *
				Cressagian				Stairsian									480.8 *
				Cressagian				Skullrockian			Demingian †						482 *
											Demingian †						485 *
Cambrian	Furongian	Stage 10										Niuchehean	Taoyuanian †		Franconian †/Dresbachian/Millardan	Late Cambrian	485.4
		Stage 10										Niuchehean		Sunwaptan			487.5
		Jiangshanian										Jiangshanian		Sunwaptan			489.5
		Jiangshanian										Jiangshanian		Steptoean			493 *
		Paibian										Paibian					494
		Paibian										Paibian	Waergangian †/Youshuanian				494.9 *
	Miaolingian	Guzhangian										Guzhangian	Wangcunian †	Marjumian	Albertian †	Middle Cambrian	497
		Drumian										Drumian	Wangcunian †	Marjumian			500.5
		Wuliuan										Wuliuan/Taijangian		Topazan			504.5
		Wuliuan										Wuliuan/Taijangian		Delamaran			506.5
	Series 2	Stage 4										Duyunian		Delamaran	Waucoban †	Early Cambrian	509
		Stage 4										Duyunian		Dyeran			511 *
		Stage 3										Nangaoian		Dyeran			514
														Montezuman			514.8 *
														Begadean			519.9 *
	Terreneuvian	Stage 2										Meishucunian					521
		Fortunian										Meishucunian					529
		Fortunian										Jinnigian					530.7
																	538.8