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

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 4546 collections

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International Chronostratigraphic Timescale			Ordovician of Britain				Cambrian of Australia	Ten Million Year Bins	Cambrian Epochs
Quaternary	Holocene	Meghalayan						Cenozoic 6		0
		Northgrippian								0.0042
		Greenlandian								0.0082
	Pleistocene	Late Pleistocene								0.0117
		Chibanian								0.129
		Calabrian								0.774
		Gelasian								1.8
Neogene	Pliocene	Piacenzian								2.58
	Pliocene	Zanclean								3.6
	Miocene	Messinian								5.333
		Tortonian								7.246
		Serravallian						Cenozoic 5		11.63
		Langhian								13.82
		Burdigalian								15.98
		Aquitanian								20.44
Paleogene	Oligocene	Chattian						Cenozoic 4		23.03
	Oligocene	Rupelian						Cenozoic 4		27.82
	Eocene	Priabonian						Cenozoic 3		33.9
		Bartonian						Cenozoic 3		37.71
		Lutetian						Cenozoic 2		41.2
		Ypresian						Cenozoic 2		47.8
	Paleocene	Thanetian						Cenozoic 1		56
		Selandian								59.2
		Danian								61.6
Cretaceous	Late Cretaceous	Maastrichtian						Cretaceous 8		66
		Campanian						Cretaceous 7		72.1
		Santonian						Cretaceous 6		83.6
		Coniacian								86.3
		Turonian								89.8
		Cenomanian						Cretaceous 5		93.9
	Early Cretaceous	Albian						Cretaceous 4		100.5
		Aptian						Cretaceous 3		113
		Barremian						Cretaceous 2		121.4
		Hauterivian						Cretaceous 2		125.77
		Valanginian						Cretaceous 1		132.6
		Berriasian						Cretaceous 1		139.8
Jurassic	Late Jurassic	Tithonian						Jurassic 6		145
		Kimmeridgian						Jurassic 5		149.2
		Oxfordian								154.8
	Middle Jurassic	Callovian								161.5
		Bathonian						Jurassic 4		165.3
		Bajocian						Jurassic 4		168.2
		Aalenian						Jurassic 3		170.9
	Early Jurassic	Toarcian						Jurassic 3		174.7
		Pliensbachian						Jurassic 2		184.2
		Sinemurian						Jurassic 1		192.9
		Hettangian						Jurassic 1		199.5
Triassic	Late Triassic	Rhaetian						Triassic 4		201.4
		Norian						Triassic 4		208.5
		Carnian						Triassic 3		227
	Middle Triassic	Ladinian						Triassic 2		237
	Middle Triassic	Anisian						Triassic 2		242
	Early Triassic	Olenekian						Triassic 1		247.2
	Early Triassic	Induan						Triassic 1		251.2
Permian	Lopingian	Changhsingian						Permian 4		251.902
	Lopingian	Wuchiapingian								254.14
	Guadalupian	Capitanian								259.51
		Wordian								264.28
		Roadian						Permian 3		266.9
	Cisuralian	Kungurian						Permian 2		273.01
		Artinskian								283.5
		Sakmarian								290.1
		Asselian						Permian 1		293.52
Carboniferous	Pennsylvanian	Gzhelian						Carboniferous 5		298.9
		Kasimovian	303.7					Carboniferous 5
		Moscovian	Carboniferous 4	307
		Bashkirian	Carboniferous 4	315.2
	Mississippian	Serpukhovian	Carboniferous 3	323.2
		Visean	Carboniferous 2	330.9
		Tournaisian	Carboniferous 1	346.7
Devonian	Late Devonian	Famennian	Devonian 5	358.9
	Late Devonian	Frasnian	Devonian 4	372.2
	Middle Devonian	Givetian	Devonian 3	382.7
	Middle Devonian	Eifelian	Devonian 3	387.7
	Early Devonian	Emsian	Devonian 2	393.3
		Pragian	Devonian 1	407.6
		Lochkovian	Devonian 1	410.8
Silurian	Pridoli		Silurian 2	419.2
	Ludlow	Ludfordian		423
	Ludlow	Gorstian		425.6
	Wenlock	Homerian		427.4
	Wenlock	Sheinwoodian		430.5
	Llandovery	Telychian	Silurian 1	433.4
		Aeronian		438.5
		Rhuddanian		440.8
Ordovician	Late Ordovician	Hirnantian	Ashgill	Hirnantian	Ordovician 5	443.8
		Katian		Rawtheyan		445.2
				Cautleyan		448.9 *
				Pusgillian		449.3 *
			Caradoc	Streffordian		Onnian †	449.6 *
				Cheneyan			451.5 *
				Burrellian			452.7 *
		Sandbian			Ordovician 4		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		Ordovician 3		458.4
		Darriwilian		Abereiddian/Early Llanvirn		Ordovician 3		461.3 *
		Dapingian		Abereiddian/Early Llanvirn		Ordovician 2		467.3
		Dapingian	Arenig	Fennian				468.4 *
	Early Ordovician	Floian		Fennian				470
				Whitlandian				471.1 *
				Moridunian				474.3 *
		Tremadocian	Tremadoc	Migneintian		Ordovician 1		477.7
			Tremadoc	Cressagian				480.8 *
								485 *
Cambrian	Furongian	Stage 10				Datsonian		Cambrian 5	Late Cambrian	485.4
		Stage 10				Payntonian				486.8 *
		Jiangshanian				Iverian				489.5
		Paibian				Idamean				494
	Miaolingian	Guzhangian				Mindyallan		Cambrian 4	Middle Cambrian	497
		Guzhangian				Boomerangian				499
		Drumian				Undillan				500.5
		Drumian				Floran				503
		Wuliuan				Templetonian		Cambrian 3		504.5
		Wuliuan				Ordian				507.8 *
	Series 2	Stage 4				Ordian			Early Cambrian	509
		Stage 4								510.8 *
		Stage 3						Cambrian 2		514
	Terreneuvian	Stage 2						Cambrian 2		521
	Terreneuvian	Fortunian						Cambrian 1		529
										538.8