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

Show more time

Show linear time

International Chronostratigraphic Timescale			Ordovician of Britain				Cambrian of North America		Ordovician 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	Bolindian	Ordovician 5	443.8
		Katian		Rawtheyan			445.2
				Cautleyan			448.9 *
				Cautleyan	Eastonian		449 *
				Pusgillian			449.3 *
			Caradoc	Streffordian			Onnian †	449.6 *
				Cheneyan				451.5 *
				Cheneyan	Gisbornian			452 *
				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		Darriwilian	Ordovician 3		458.4
		Darriwilian		Abereiddian/Early Llanvirn		Darriwilian	Ordovician 3		461.3 *
		Dapingian		Abereiddian/Early Llanvirn		Yapeenian	Ordovician 2		467.3
			Arenig	Fennian		Yapeenian			468.4 *
						Castlemainian			468.5 *
	Early Ordovician	Floian				Chewtonian			470
				Whitlandian		Chewtonian			471.1 *
						Bendigonian			471.8 *
						Lancefieldian			473.5 *
				Moridunian					474.3 *
		Tremadocian	Tremadoc	Migneintian			Ordovician 1		477.7
				Cressagian					480.8 *
				Cressagian		Warendian			482.8 *
						Warendian			485 *
Cambrian	Furongian	Stage 10				Franconian †/Dresbachian/Millardan			Cambrian 5	Late Cambrian	485.4
		Stage 10									Sunwaptan	487.5
		Jiangshanian									Sunwaptan	489.5
		Jiangshanian									Steptoean	493 *
		Paibian									Steptoean	494
	Miaolingian	Guzhangian				Marjumian			Albertian †	Cambrian 4	Middle Cambrian	497
		Drumian				Marjumian				Cambrian 4		500.5
		Wuliuan				Topazan				Cambrian 3		504.5
		Wuliuan				Delamaran						506.5
	Series 2	Stage 4				Delamaran			Waucoban †		Early Cambrian	509
		Stage 4				Dyeran						511 *
		Stage 3				Dyeran				Cambrian 2		514
						Montezuman						514.8 *
						Begadean						519.9 *
	Terreneuvian	Stage 2										521
	Terreneuvian	Fortunian								Cambrian 1		529
												538.8