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
K. M. Cohen, S.C. Finney, P.L. Gibbard and J.-X. Fan. 2023. The ICS International Chronostratigraphic Chart v2023/09. 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				Ordovician of China			Cambrian of Kazakhstan	Ordovician of Ibero-Bohemia				Obsolete Names for ICS Units			Cambrian Epochs
Neogene	Pliocene	Piacenzian													Tertiary †				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														Longtanian †			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	Hirnantian	Xiaoxita †/Shikou	Wufeng †	Kosovian	443.8
		Katian		Rawtheyan	Chientangkiangian			Kralodvorian	Bohdalec †	445.2
				Cautleyan						448.9 *
				Pusgillian						449.3 *
				Pusgillian	Neichianshanian/Hanjiang					449.5
			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		Darriwilian				Guniu †/Hulo				458.4
								Dobrotivian						458.5 *
								Oretanian						459.7 *
				Abereiddian/Early Llanvirn										461.3 *
									Sarka †					461.7 *
							Hunjiang †		Sarka †	Dawan †/Daobaowan/Ningkuo				466.3 *
		Dapingian				Dapingian			Klabava †					467.3
								Arenigian						468
			Arenig	Fennian										468.4 *
	Early Ordovician	Floian		Fennian		Yiyangian								470
				Whitlandian										471.1 *
				Moridunian										474.3 *
		Tremadocian	Tremadoc	Migneintian		Xinchangian		Ungurian	Tremadocian						477.7
				Migneintian						Lianghekou †					477.9 *
				Cressagian											480.8 *
															485 *
Cambrian	Furongian	Stage 10							Batyrbaian						Late Cambrian		485.4
		Jiangshanian							Batyrbaian								489.5
									Aksaian							490.7 *
									Sakian							492.2 *
		Paibian							Sakian							494
	Miaolingian	Guzhangian							Ayusokkanian						Series 3 †	Middle Cambrian	497
		Guzhangian															499.5
		Drumian							Zhanaarykian								500.5
		Drumian							Tuesaian								503
		Wuliuan							Tuesaian								Stage 5 †	504.5
		Wuliuan															Stage 5 †	505.3
	Series 2	Stage 4															Early Cambrian	509
									Toyonian									510 *
									Botomian									512.5 *
		Stage 3							Botomian									514
		Stage 3							Atdabanian									515.6 *
	Terreneuvian	Stage 2							Tommotian									521
		Stage 2																525.5
		Fortunian																529
																			538.8