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				Ten Million Year Bins	Cambrian of North America		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				Cambrian 5		Franconian †/Dresbachian/Millardan	Late Cambrian	485.4
		Stage 10								Sunwaptan	487.5
		Jiangshanian								Sunwaptan	489.5
		Jiangshanian								Steptoean	493 *
		Paibian								Steptoean	494
	Miaolingian	Guzhangian				Cambrian 4		Marjumian	Albertian †	Middle Cambrian	497
		Drumian				Cambrian 4		Marjumian			500.5
		Wuliuan				Cambrian 3		Topazan			504.5
		Wuliuan						Delamaran			506.5
	Series 2	Stage 4						Delamaran	Waucoban †	Early Cambrian	509
		Stage 4						Dyeran			511 *
		Stage 3				Cambrian 2		Dyeran			514
								Montezuman			514.8 *
								Begadean			519.9 *
	Terreneuvian	Stage 2									521
	Terreneuvian	Fortunian				Cambrian 1					529
											538.8