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
K. M. Cohen, S.C. Finney, P.L. Gibbard and J.-X. Fan. 2023. The ICS International Chronostratigraphic Chart v2023/09. 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				Obsolete Names for ICS Units			Ordovician of North America						Cambrian of China		Cambrian of North America
Quaternary	Holocene	Meghalayan																		0
		Northgrippian																		0.0042
		Greenlandian																		0.0082
	Pleistocene	Late Pleistocene																		0.0117
		Chibanian																		0.129
		Calabrian																		0.774
		Gelasian																		1.8
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			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 *
						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								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					489.5				Sunwaptan
		Jiangshanian						Jiangshanian					Steptoean				493 *
		Paibian						Paibian									494
		Paibian						Paibian						Waergangian †/Youshuanian			494.9 *
	Miaolingian	Guzhangian						Series 3 †					Guzhangian	Wangcunian †	Marjumian	Albertian †	Middle Cambrian	497
		Drumian											Drumian	Wangcunian †	Marjumian			500.5
		Wuliuan											Stage 5 †	Wuliuan/Taijangian				Topazan	504.5
		Wuliuan											Stage 5 †	Wuliuan/Taijangian				Delamaran	506.5
	Series 2	Stage 4												Duyunian		Waucoban †	Early Cambrian	Delamaran	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