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
M. Kretzoi. 1942. Necroteuthis n. g. (Ceph. Dibr., Necroteuthidae N. F.) aus dem Oligozän von Budapest und das system der Dibranchiata. Földtani Közlöny 72:125-238 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

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International Chronostratigraphic Timescale			Ordovician of Britain				Ordovician of Australia	Ordovician of North America						Obsolete Names for ICS Units			Cambrian of North America
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	Bolindian	Cincinnatian	Gamachian	443.8
		Katian		Rawtheyan			Gamachian	445.2
				Rawtheyan			Richmondian	446 *
				Cautleyan				448.9 *
				Cautleyan	Eastonian			449 *
				Pusgillian				449.3 *
			Caradoc	Streffordian				Onnian †	449.6 *
							Maysvillian		Rocklandian †/Shermanian/Ashbyan/Kirkfieldian/Blackriveran/Wildernessian/Trentonian/Franklinian	449.8 *
							Edenian			450.4 *
						Mohawkian	Chatfieldian			451.1 *
				Cheneyan						451.5 *
				Cheneyan	Gisbornian					452 *
				Burrellian						452.7 *
		Sandbian								453
								Actonian †		453.2 *
							Turinian	Actonian †		453.7 *
								Marshbrookian †		Woolstonian †	454.2 *
								Longvillian †			455.2 *
				Aurelucian							456.8 *
						Whiterockian			Canadian †		Chazyan †/Marmor	457 *
								Soudleyan †/Harnagian/Costonian				457.4 *
	Middle Ordovician	Darriwilian	Llanvirn	Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn				Darriwilian				458.4
		Darriwilian		Abereiddian/Early Llanvirn				Darriwilian				461.3 *
		Dapingian		Abereiddian/Early Llanvirn				Yapeenian				467.3
			Arenig	Fennian				Yapeenian				468.4 *
								Castlemainian				468.5 *
							Rangerian	Castlemainian				469.1 *
	Early Ordovician	Floian				Chewtonian	Ibexian	Blackhillsian			Jeffersonian †	Cassinian †	470
				Whitlandian		Chewtonian							471.1 *
						Bendigonian							471.8 *
						Lancefieldian							473.5 *
								Tulean					473.9 *
				Moridunian									474.3 *
		Tremadocian	Tremadoc	Migneintian									477.7
				Migneintian				Stairsian					480.3 *
				Cressagian				Stairsian					480.8 *
								Skullrockian				Demingian †	482 *
						Warendian							482.8 *
						Warendian							485 *
Cambrian	Furongian	Stage 10											Franconian †/Dresbachian/Millardan	Late Cambrian	485.4
		Stage 10													Sunwaptan	487.5
		Jiangshanian													Sunwaptan	489.5
		Jiangshanian													Steptoean	493 *
		Paibian													Steptoean	494
	Miaolingian	Guzhangian											Series 3 †	Marjumian	Albertian †	Middle Cambrian	497
		Drumian												Marjumian			500.5
		Wuliuan												Stage 5 †			Topazan	504.5
		Wuliuan												Stage 5 †			Delamaran	506.5
	Series 2	Stage 4													Waucoban †	Early Cambrian	Delamaran	509
		Stage 4															Dyeran	511 *
		Stage 3															Dyeran	514
																	Montezuman	514.8 *
																	Begadean	519.9 *
	Terreneuvian	Stage 2																521
	Terreneuvian	Fortunian																529
																			538.8