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
K. M. Cohen, S.C. Finney, P.L. Gibbard and J.-X. Fan. 2023. The ICS International Chronostratigraphic Chart v2023/09. 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 Ibero-Bohemia				Ordovician of North America						Obsolete Names for ICS Units			Cambrian of North America
Neogene	Pliocene	Piacenzian															Tertiary †					2.58
	Pliocene	Zanclean																				3.6
	Miocene	Messinian																				5.333
		Tortonian																				7.246
		Serravallian																				11.63
		Langhian																				13.82
		Burdigalian																				15.98
		Aquitanian																				20.44
Paleogene	Oligocene	Chattian																				23.03
	Oligocene	Rupelian																				27.82
	Eocene	Priabonian																				33.9
		Bartonian																				37.71
		Lutetian																				41.2
		Ypresian																				47.8
	Paleocene	Thanetian																				56
		Selandian																				59.2
		Danian																				61.6
Cretaceous	Late Cretaceous	Maastrichtian																				66
		Campanian																				72.1
		Santonian																				83.6
		Coniacian																				86.3
		Turonian																				89.8
		Cenomanian																				93.9
	Early Cretaceous	Albian																				100.5
		Aptian																				113
		Barremian																				121.4
		Hauterivian																				125.77
		Valanginian																				132.6
		Berriasian																				139.8
Jurassic	Late Jurassic	Tithonian																				145
		Kimmeridgian																				149.2
		Oxfordian																				154.8
	Middle Jurassic	Callovian																				161.5
		Bathonian																				165.3
		Bajocian																				168.2
		Aalenian																				170.9
	Early Jurassic	Toarcian																				174.7
		Pliensbachian																				184.2
		Sinemurian																				192.9
		Hettangian																				199.5
Triassic	Late Triassic	Rhaetian																				201.4
		Norian																				208.5
		Carnian																				227
	Middle Triassic	Ladinian																				237
	Middle Triassic	Anisian																				242
	Early Triassic	Olenekian																				247.2
	Early Triassic	Induan																				251.2
Permian	Lopingian	Changhsingian																				251.902
	Lopingian	Wuchiapingian																Longtanian †				254.14
	Guadalupian	Capitanian																				259.51
		Wordian																				264.28
		Roadian																				266.9
	Cisuralian	Kungurian																				273.01
		Artinskian																				283.5
		Sakmarian																				290.1
		Asselian																				293.52
Carboniferous	Pennsylvanian	Gzhelian																				298.9
		Kasimovian																				303.7
		Moscovian																				307
		Bashkirian																				315.2
	Mississippian	Serpukhovian																				323.2
		Visean																				330.9
		Tournaisian																				346.7
Devonian	Late Devonian	Famennian																				358.9
	Late Devonian	Frasnian	372.2
	Middle Devonian	Givetian	382.7
	Middle Devonian	Eifelian	387.7
	Early Devonian	Emsian	393.3
		Pragian	407.6
		Lochkovian	410.8
Silurian	Pridoli		419.2
	Ludlow	Ludfordian	423
	Ludlow	Gorstian	425.6
	Wenlock	Homerian	427.4
	Wenlock	Sheinwoodian	430.5
	Llandovery	Telychian	433.4
		Aeronian	438.5
		Rhuddanian	440.8
Ordovician	Late Ordovician	Hirnantian	Ashgill	Hirnantian	Kosovian	Cincinnatian	Gamachian	443.8
		Katian		Rawtheyan	Kralodvorian		Gamachian	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 *
							Turinian		Actonian †		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 *
								Liben †	Soudleyan †/Harnagian/Costonian						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	Tremadocian											477.7
				Migneintian			Stairsian									480.3 *
				Cressagian			Stairsian									480.8 *
				Cressagian			Skullrockian								Demingian †	482 *
															Demingian †	485 *
Cambrian	Furongian	Stage 10														Franconian †/Dresbachian/Millardan	Late Cambrian	485.4
		Stage 10																Sunwaptan	487.5
		Jiangshanian																Sunwaptan	489.5
		Jiangshanian																Steptoean	493 *
		Paibian																Steptoean	494
	Miaolingian	Guzhangian														Series 3 †	Marjumian	Albertian †	Middle Cambrian	497
		Drumian															Marjumian			500.5
		Wuliuan															Stage 5 †			Topazan	504.5
		Wuliuan															Stage 5 †			Delamaran	506.5
	Series 2	Stage 4																Waucoban †	Early Cambrian	Delamaran	509
		Stage 4																		Dyeran	511 *
		Stage 3																		Dyeran	514
																				Montezuman	514.8 *
																				Begadean	519.9 *
	Terreneuvian	Stage 2																			521
	Terreneuvian	Fortunian																			529
																						538.8