PBDB Timescale

Obsolete Names for ICS Units

The interval definitions in this timescale are derived from the following sources:

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
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, M. D. Schmitz and G. M. Ogg. 2020. Geologic Time Scale 2020 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

There are 55 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 92 collections

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International Chronostratigraphic Timescale			Obsolete Names for ICS Units			Cambrian of North America		Ordovician of the Baltic				Ten Million Year Bins	Silurian of North America			Cretaceous Subepochs	Cenozoic Subepochs
Quaternary	Holocene	Meghalayan										Cenozoic 6						0
		Northgrippian																0.0042
		Greenlandian																0.0082
	Pleistocene	Late Pleistocene															Late Pleistocene	0.0117
		Chibanian															Middle Pleistocene	0.129
		Calabrian															Early Pleistocene	0.774
		Gelasian															Early Pleistocene	1.8
Neogene	Pliocene	Piacenzian	Tertiary †														Late Pliocene	2.58
	Pliocene	Zanclean															Early Pliocene	3.6
	Miocene	Messinian															Late Miocene	5.333
		Tortonian															Late Miocene	7.246
		Serravallian										Cenozoic 5					Middle Miocene	11.63
		Langhian															Middle Miocene	13.82
		Burdigalian															Early Miocene	15.98
		Aquitanian															Early Miocene	20.44
Paleogene	Oligocene	Chattian										Cenozoic 4					Late Oligocene	23.03
	Oligocene	Rupelian										Cenozoic 4					Early Oligocene	27.82
	Eocene	Priabonian										Cenozoic 3					Late Eocene	33.9
		Bartonian										Cenozoic 3					Middle Eocene	37.71
		Lutetian										Cenozoic 2					Middle Eocene	41.2
		Ypresian										Cenozoic 2					Early Eocene	47.8
	Paleocene	Thanetian										Cenozoic 1					Late Paleocene	56
		Selandian															Middle Paleocene	59.2
		Danian															Early Paleocene	61.6
Cretaceous	Late Cretaceous	Maastrichtian										Cretaceous 8				Senonian		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				Gallic		100.5
		Aptian										Cretaceous 3						113
		Barremian										Cretaceous 2						121.4
		Hauterivian										Cretaceous 2				Neocomian		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		Longtanian †														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	Cayugan	419.2
	Pridoli					Niagaran	422.5 *
	Ludlow	Ludfordian					423
	Ludlow	Gorstian					425.6
	Wenlock	Homerian					Lockportian	427.4
	Wenlock	Sheinwoodian						430.5
	Llandovery	Telychian			Silurian 1		Ontarian	433.4
		Aeronian						438.5
								Alexandrian	438.7 *
						Medinan	Clinton		440.1 *
									440.7 *
		Rhuddanian	440.8
Ordovician	Late Ordovician	Hirnantian	Harju		Porkuni	Ordovician 5				443.8
		Katian			Pirgu					445.2
					Vormsi					449.6 *
					Nabala					Johvi †	450 *
			Viru		Rakvere						450.6 *
					Oandu						452 *
		Sandbian			Keila	Idavere †				Ordovician 4	453
					Haljala						453.9
					Kukruse						456.4 *
					Uhaku	Aluoja †					457.5 *
	Middle Ordovician	Darriwilian			Uhaku					Ordovician 3	458.4
					Lasnamagi						458.9 *
					Aseri						460.4 *
			Oeland		Kunda						462.9 *
					Kunda	Valaste †/Hunderum					464.3 *
					Volkhov						Langevoja †/Vaana/Saka	467.1 *
		Dapingian			Volkhov					Ordovician 2		467.3
		Dapingian			Billingen							469.3 *
	Early Ordovician	Floian										470
						Latorp †						470.1 *
					Hunneberg							473.7 *
		Tremadocian			Hunneberg					Ordovician 1		477.7
					Varangu							481.3 *
					Pakerort							482.2 *
Cambrian	Furongian	Stage 10			Pakerort	Franconian †/Dresbachian/Millardan						Cambrian 5	Late Cambrian	485.4
														486.3 *
														486.5
														Sunwaptan	487.5
		Jiangshanian												Sunwaptan	489.5
		Jiangshanian												Steptoean	493 *
		Paibian												Steptoean	494
	Miaolingian	Guzhangian		Series 3 †		Marjumian						Albertian †	Cambrian 4	Middle Cambrian	497
		Drumian				Marjumian							Cambrian 4		500.5
		Wuliuan				Stage 5 †							Topazan		Cambrian 3	504.5
		Wuliuan				Stage 5 †							Delamaran			506.5
	Series 2	Stage 4										Waucoban †	Delamaran	Early Cambrian		509
		Stage 4											Dyeran			511 *
		Stage 3											Dyeran		Cambrian 2	514
													Montezuman			514.8 *
													Begadean			519.9 *
	Terreneuvian	Stage 2														521
	Terreneuvian	Fortunian													Cambrian 1	529
																		538.8