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
D. H. Erwin and S. A. Bowring. 2004. Cambrian time scale. 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				Cambrian of Siberia			Cambrian of Kazakhstan	Cambrian of North America		Cambrian Epochs
Quaternary	Holocene	Meghalayan																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																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																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	Kosovian	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						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							458.4
					Dobrotivian						458.5 *
					Oretanian						459.7 *
				Abereiddian/Early Llanvirn							461.3 *
						Sarka †					461.7 *
		Dapingian				Klabava †					467.3
					Arenigian						468
			Arenig	Fennian							468.4 *
	Early Ordovician	Floian		Fennian							470
				Whitlandian							471.1 *
				Moridunian							474.3 *
		Tremadocian	Tremadoc	Migneintian	Tremadocian						Ungurian	477.7
				Cressagian								480.8 *
				Cressagian								Mansian †	483.55 *
												Mansian †	485 *
Cambrian	Furongian	Stage 10									Batyrbaian	Tavgian †	Ketyan †/Yurakian	Batyrbaian	Franconian †/Dresbachian/Millardan	Late Cambrian	485.4
		Stage 10															Sunwaptan	487.5
		Jiangshanian																489.5
											Aksaian			Aksaian				490.7 *
											Sakian			Sakian				492.2 *
																	Steptoean	493 *
		Paibian																494
		Paibian											Ensyan †/Maduan/Nganasanian					494.7 *
	Miaolingian	Guzhangian									Ayusokkanian			Ayusokkanian	Marjumian	Albertian †	Middle Cambrian	497
		Guzhangian									Mayan/Menevian							499.5
		Drumian												Zhanaarykian				500.5
		Drumian												Tuesaian				503
		Wuliuan									Amgan/Solvan			Tuesaian	Topazan			504.5
															Topazan			505.3
															Delamaran			506.5
	Series 2	Stage 4														Waucoban †	Early Cambrian	509
											Toyonian	Lenian †		Toyonian				510 *
											Toyonian			Toyonian	Dyeran			511 *
											Botomian			Botomian				512.5 *
		Stage 3																514
															Montezuman			514.8 *
											Atdabanian			Atdabanian	Montezuman			515.6 *
											Atdabanian			Atdabanian	Begadean			519.9 *
	Terreneuvian	Stage 2									Tommotian			Tommotian				521
		Stage 2									Nemakit-Daldynian							525.5
		Fortunian									Nemakit-Daldynian	Manykaian †						529
																		538.8