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

Show more time

Show linear time

International Chronostratigraphic Timescale			Ordovician of Britain				Ordovician of North America					Cambrian of Kazakhstan	Cambrian of China		Ordovician of Ibero-Bohemia				Cambrian of North America		Cambrian Epochs
Ordovician	Late Ordovician	Hirnantian	Ashgill	Hirnantian			Cincinnatian	Gamachian							Kosovian							443.8
		Katian		Rawtheyan				Gamachian							Kralodvorian	Bohdalec †						445.2
				Rawtheyan				Richmondian														446 *
				Cautleyan																		448.9 *
				Pusgillian																		449.3 *
			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																		458.4
															Dobrotivian							458.5 *
															Oretanian							459.7 *
				Abereiddian/Early Llanvirn																		461.3 *
																Sarka †						461.7 *
		Dapingian														Klabava †						467.3
															Arenigian							468
			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			Tremadocian							477.7
				Migneintian				Stairsian														480.3 *
				Cressagian				Stairsian														480.8 *
				Cressagian				Skullrockian			Demingian †											482 *
											Demingian †											485 *
Cambrian	Furongian	Stage 10										Batyrbaian	Niuchehean	Taoyuanian †						Franconian †/Dresbachian/Millardan	Late Cambrian	485.4
		Stage 10											Niuchehean						Sunwaptan			487.5
		Jiangshanian											Jiangshanian									489.5
												Aksaian										490.7 *
												Sakian										492.2 *
																			Steptoean			493 *
		Paibian											Paibian									494
		Paibian											Paibian	Waergangian †/Youshuanian								494.9 *
	Miaolingian	Guzhangian										Ayusokkanian	Guzhangian	Wangcunian †					Marjumian	Albertian †	Middle Cambrian	497
		Guzhangian											Guzhangian									499.5
		Drumian										Zhanaarykian	Drumian									500.5
		Drumian										Tuesaian	Drumian									503
		Wuliuan										Tuesaian	Wuliuan/Taijangian						Topazan			504.5
																			Topazan			505.3
																			Delamaran			506.5
	Series 2	Stage 4											Duyunian							Waucoban †	Early Cambrian	509
												Toyonian										510 *
												Toyonian							Dyeran			511 *
												Botomian										512.5 *
		Stage 3											Nangaoian									514
																			Montezuman			514.8 *
												Atdabanian							Montezuman			515.6 *
												Atdabanian							Begadean			519.9 *
	Terreneuvian	Stage 2										Tommotian	Meishucunian									521
		Stage 2										525.5
		Fortunian										529
		Fortunian										Jinnigian	530.7
																						538.8