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
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

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 Britain		Obsolete Names for ICS Units			Cambrian of North America		Ordovician of China			Ordovician of North America				Ordovician of the Baltic
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	Hirnantian	Xiaoxita †/Shikou	Wufeng †	Cincinnatian			Gamachian	Harju	Porkuni	443.8
		Katian		Rawtheyan	Chientangkiangian						Gamachian		Pirgu	445.2
				Rawtheyan							Richmondian			446 *
				Cautleyan					448.9 *
				Pusgillian					449.3 *
				Pusgillian	Neichianshanian/Hanjiang				449.5
			Caradoc	Streffordian					Onnian †				Vormsi	449.6 *
											Maysvillian		Vormsi	Rocklandian †/Shermanian/Ashbyan/Kirkfieldian/Blackriveran/Wildernessian/Trentonian/Franklinian	449.8 *
											Maysvillian		Nabala		Johvi †	450 *
											Edenian		Nabala			450.4 *
											Edenian	Viru	Rakvere			450.6 *
								Mohawkian			Chatfieldian					451.1 *
				Cheneyan												451.5 *
				Cheneyan									Oandu			452 *
				Burrellian									Oandu			452.7 *
		Sandbian											Keila		Idavere †	453
									Actonian †							453.2 *
											Turinian					453.7 *
													Haljala			453.9
									Marshbrookian †							Woolstonian †	454.2 *
									Longvillian †								455.2 *
													Kukruse				456.4 *
				Aurelucian													456.8 *
								Whiterockian						Canadian †			Chazyan †/Marmor	457 *
									Soudleyan †/Harnagian/Costonian									457.4 *
									Soudleyan †/Harnagian/Costonian				Uhaku		Aluoja †			457.5 *
	Middle Ordovician	Darriwilian	Llanvirn	Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn		Darriwilian			Guniu †/Hulo				Uhaku					458.4
													Lasnamagi					458.9 *
													Aseri					460.4 *
				Abereiddian/Early Llanvirn									Aseri					461.3 *
												Oeland	Kunda					462.9 *
															Valaste †/Hunderum			464.3 *
							Hunjiang †		Dawan †/Daobaowan/Ningkuo									466.3 *
													Volkhov					Langevoja †/Vaana/Saka	467.1 *
		Dapingian				Dapingian													467.3
			Arenig	Fennian						468.4 *
										Rangerian	469.1 *
										Rangerian	Billingen		469.3 *
	Early Ordovician	Floian				Yiyangian		Ibexian		Blackhillsian			Jeffersonian †				Cassinian †		470
															Latorp †				470.1 *
				Whitlandian															471.1 *
											Hunneberg								473.7 *
										Tulean									473.9 *
				Moridunian															474.3 *
		Tremadocian	Tremadoc	Migneintian		Xinchangian													477.7
									Lianghekou †										477.9 *
										Stairsian									480.3 *
				Cressagian															480.8 *
											Varangu								481.3 *
										Skullrockian	Varangu						Demingian †		482 *
											Pakerort								482.2 *
																			485 *
Cambrian	Furongian	Stage 10				Merioneth	Dolgellian/Trempealeauan		Franconian †/Dresbachian/Millardan											485.4
																				486.3 *
																				486.5
								Sunwaptan													487.5
							Festiniogian														489.2 *
		Jiangshanian																			489.5
								Steptoean													493 *
							Maentwrogian														493.1 *
		Paibian					Maentwrogian														494
	Miaolingian	Guzhangian				St Davids		Series 3 †	Marjumian												Albertian †	497
		Drumian							Marjumian													500.5
		Wuliuan							Stage 5 †													Topazan	504.5
		Wuliuan							Stage 5 †													Delamaran	506.5
	Series 2	Stage 4				Caerfai															Waucoban †	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