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 4547 collections

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International Chronostratigraphic Timescale			Ordovician of Britain				Ordovician of Ibero-Bohemia				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	Kosovian	Ordovician 5	443.8
		Katian		Rawtheyan	Kralodvorian		Bohdalec †	445.2
				Cautleyan				448.9 *
				Pusgillian				449.3 *
			Caradoc	Streffordian				Onnian †	449.6 *
				Streffordian	Berounian				449.7 *
				Cheneyan					451.5 *
				Burrellian					452.7 *
		Sandbian				Ordovician 4			453
								Actonian †	453.2 *
								Marshbrookian †	Woolstonian †	454.2 *
								Longvillian †		455.2 *
										Zahorany †/Vinice	Letna †	456.2 *
				Aurelucian								456.8 *
								Soudleyan †/Harnagian/Costonian				457.4 *
							Liben †	Soudleyan †/Harnagian/Costonian				458 *
	Middle Ordovician	Darriwilian	Llanvirn	Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn				Ordovician 3				458.4
					Dobrotivian							458.5 *
					Oretanian							459.7 *
				Abereiddian/Early Llanvirn								461.3 *
							Sarka †					461.7 *
		Dapingian					Klabava †	Ordovician 2				467.3
					Arenigian							468
			Arenig	Fennian								468.4 *
	Early Ordovician	Floian		Fennian								470
				Whitlandian								471.1 *
				Moridunian								474.3 *
		Tremadocian	Tremadoc	Migneintian	Tremadocian			Ordovician 1				477.7
			Tremadoc	Cressagian								480.8 *
												485 *
Cambrian	Furongian	Stage 10						Cambrian 5				Late Cambrian	485.4
		Jiangshanian											489.5
		Paibian											494
	Miaolingian	Guzhangian						Cambrian 4				Middle Cambrian	497
		Drumian						Cambrian 4					500.5
		Wuliuan						Cambrian 3					504.5
	Series 2	Stage 4						Cambrian 3				Early Cambrian	509
	Series 2	Stage 3						Cambrian 2					514
	Terreneuvian	Stage 2						Cambrian 2					521
	Terreneuvian	Fortunian						Cambrian 1					529
													538.8