PBDB Timescale

Cambrian of North America

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
F. M. Gradstein, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 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

There are 12 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 1827 collections

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International Chronostratigraphic Timescale			Cambrian of North America		Ordovician of the Baltic				Cambrian of Britain		Cambrian of Australia	Ordovician of North America			Cambrian of West Avalonia	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	Harju	Porkuni	Cincinnatian	Gamachian	443.8
		Katian		Pirgu		Gamachian	445.2
				Pirgu		Richmondian	446 *
				Vormsi		Richmondian	449.6 *
				Vormsi		Maysvillian	Rocklandian †/Shermanian/Ashbyan/Kirkfieldian/Blackriveran/Wildernessian/Trentonian/Franklinian	449.8 *
				Nabala		Maysvillian		Johvi †	450 *
				Nabala		Edenian			450.4 *
			Viru	Rakvere		Edenian			450.6 *
				Rakvere	Mohawkian	Chatfieldian			451.1 *
				Oandu					452 *
		Sandbian		Keila				Idavere †	453
				Keila		Turinian			453.7 *
				Haljala					453.9
				Kukruse					456.4 *
				Kukruse	Whiterockian		Canadian †		Chazyan †/Marmor	457 *
				Uhaku				Aluoja †		457.5 *
	Middle Ordovician	Darriwilian		Uhaku						458.4
				Lasnamagi						458.9 *
				Aseri						460.4 *
			Oeland	Kunda						462.9 *
				Kunda				Valaste †/Hunderum		464.3 *
				Volkhov						Langevoja †/Vaana/Saka	467.1 *
		Dapingian									467.3
						Rangerian					469.1 *
				Billingen		Rangerian					469.3 *
	Early Ordovician	Floian			Ibexian	Blackhillsian			Jeffersonian †		Cassinian †	470
								Latorp †				470.1 *
				Hunneberg								473.7 *
						Tulean						473.9 *
		Tremadocian				Tulean						477.7
						Stairsian						480.3 *
				Varangu		Stairsian						481.3 *
				Varangu		Skullrockian					Demingian †	482 *
				Pakerort							Demingian †	482.2 *
Cambrian	Furongian	Stage 10		Pakerort			Franconian †/Dresbachian/Millardan		Merioneth		Dolgellian/Trempealeauan	Datsonian	Late Cambrian	485.4
														486.3 *
														486.5
												Payntonian		486.8 *
					Sunwaptan										487.5
											Festiniogian				489.2 *
		Jiangshanian										Iverian			489.5
					Steptoean										493 *
											Maentwrogian				493.1 *
		Paibian									Maentwrogian	Idamean			494
	Miaolingian	Guzhangian			Marjumian		Albertian †		St Davids			Mindyallan	Middle Cambrian		497
												Mindyallan			Arcadian	498.4
												Boomerangian				499
		Drumian										Undillan				500.5
		Drumian										Floran				503
		Wuliuan			Topazan							Templetonian				504.5
					Delamaran							Templetonian				506.5
												Ordian				507.8 *
	Series 2	Stage 4					Waucoban †		Caerfai			Ordian	Branchian		Early Cambrian	509
																510.8 *
					Dyeran											511 *
		Stage 3			Dyeran											514
					Montezuman											514.8 *
					Montezuman								Placentian			517.1
					Begadean											519.9 *
	Terreneuvian	Stage 2														521
	Terreneuvian	Fortunian														529
																	538.8