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
F. M. Gradstein, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 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 Britain		Ordovician of China		Cambrian of Australia	Cambrian Epochs	Obsolete Names for ICS Units
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 †	443.8
		Katian		Rawtheyan	Chientangkiangian			445.2
				Cautleyan				448.9 *
				Pusgillian				449.3 *
				Pusgillian	Neichianshanian/Hanjiang			449.5
			Caradoc	Streffordian				Onnian †	449.6 *
				Cheneyan					451.5 *
				Burrellian					452.7 *
		Sandbian							453
								Actonian †	453.2 *
								Marshbrookian †	Woolstonian †	454.2 *
								Longvillian †		455.2 *
				Aurelucian				Longvillian †		456.8 *
				Aurelucian				Soudleyan †/Harnagian/Costonian		457.4 *
	Middle Ordovician	Darriwilian	Llanvirn	Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn		Darriwilian		Guniu †/Hulo		458.4
				Abereiddian/Early Llanvirn				Guniu †/Hulo		461.3 *
							Hunjiang †	Dawan †/Daobaowan/Ningkuo		466.3 *
		Dapingian				Dapingian				467.3
		Dapingian	Arenig	Fennian		Dapingian				468.4 *
	Early Ordovician	Floian		Fennian		Yiyangian				470
				Whitlandian						471.1 *
				Moridunian						474.3 *
		Tremadocian	Tremadoc	Migneintian		Xinchangian				477.7
				Migneintian				Lianghekou †		477.9 *
				Cressagian						480.8 *
										485 *
Cambrian	Furongian	Stage 10				Merioneth	Dolgellian/Trempealeauan				Datsonian	Late Cambrian	485.4
							Dolgellian/Trempealeauan				Payntonian		486.8 *
							Festiniogian				Payntonian		489.2 *
		Jiangshanian					Festiniogian				Iverian		489.5
		Jiangshanian					Maentwrogian				Iverian		493.1 *
		Paibian					Maentwrogian				Idamean		494
	Miaolingian	Guzhangian				St Davids					Mindyallan	Middle Cambrian	Series 3 †		497
		Guzhangian									Boomerangian				499
		Drumian									Undillan				500.5
		Drumian									Floran			503
		Wuliuan									Templetonian			Stage 5 †	504.5
		Wuliuan									Ordian			Stage 5 †	507.8 *
	Series 2	Stage 4				Caerfai					Ordian	Early Cambrian			509
		Stage 4													510.8 *
		Stage 3													514
	Terreneuvian	Stage 2													521
	Terreneuvian	Fortunian													529
																538.8