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
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
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

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 Siberia			Ordovician of North America					Obsolete Names for ICS Units			Ordovician of Australia	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	Cincinnatian	Gamachian	Bolindian	443.8
		Katian		Rawtheyan		Gamachian		445.2
				Rawtheyan		Richmondian		446 *
				Cautleyan				448.9 *
				Cautleyan			Eastonian	449 *
				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 *
				Cheneyan			Gisbornian			452 *
				Burrellian						452.7 *
		Sandbian								453
								Actonian †		453.2 *
						Turinian		Actonian †		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				458.4
		Darriwilian		Abereiddian/Early Llanvirn				Darriwilian				461.3 *
		Dapingian		Abereiddian/Early Llanvirn				Yapeenian				467.3
			Arenig	Fennian				Yapeenian				468.4 *
								Castlemainian				468.5 *
						Rangerian		Castlemainian				469.1 *
	Early Ordovician	Floian			Ibexian	Blackhillsian		Jeffersonian †			Cassinian †	Chewtonian	470
				Whitlandian								Chewtonian	471.1 *
												Bendigonian	471.8 *
												Lancefieldian	473.5 *
						Tulean							473.9 *
				Moridunian									474.3 *
		Tremadocian	Tremadoc	Migneintian									477.7
				Migneintian		Stairsian							480.3 *
				Cressagian		Stairsian							480.8 *
						Skullrockian					Demingian †		482 *
												Warendian	482.8 *
													Mansian †	483.55 *
													Mansian †	485 *
Cambrian	Furongian	Stage 10						Batyrbaian	Tavgian †		Ketyan †/Yurakian				Franconian †/Dresbachian/Millardan	Late Cambrian	485.4
		Stage 10															Sunwaptan	487.5
		Jiangshanian																489.5
								Aksaian										490.7 *
								Sakian										492.2 *
																	Steptoean	493 *
		Paibian																494
		Paibian									Ensyan †/Maduan/Nganasanian							494.7 *
	Miaolingian	Guzhangian						Ayusokkanian							Series 3 †	Marjumian	Albertian †	Middle Cambrian	497
		Guzhangian						Mayan/Menevian											499.5
		Drumian						Mayan/Menevian											500.5
		Wuliuan						Amgan/Solvan								Stage 5 †			Topazan	504.5
		Wuliuan														Stage 5 †			Delamaran	506.5
	Series 2	Stage 4															Waucoban †	Early Cambrian		509
								Toyonian	Lenian †											510 *
								Toyonian											Dyeran	511 *
								Botomian												512.5 *
		Stage 3																		514
																			Montezuman	514.8 *
								Atdabanian											Montezuman	515.6 *
								Atdabanian											Begadean	519.9 *
	Terreneuvian	Stage 2						Tommotian												521
		Stage 2						Nemakit-Daldynian												525.5
		Fortunian						Nemakit-Daldynian	Manykaian †											529
																					538.8