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
J. A. Lillegraven and M. C. McKenna. 1986. Fossil mammals from the "Mesaverde" Formation (Late Cretaceous, Judithian) of the Bighorn and Wind River basins, Wyoming, with definitions of Late Cretaceous North American Land-Mammal "Ages". American Museum Novitates 2840:1-68 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

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			Silurian of England		Cretaceous North American Land-Mammal Ages	Cambrian of Kazakhstan	Ten Million Year Bins	Cenozoic Subepochs	Obsolete Carboniferous Ages of China
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						Lancian/Edmontonian		Cretaceous 8			66
		Campanian						Judithian/Aquilan		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			100.5
		Aptian								Cretaceous 3			113
		Barremian								Cretaceous 2			121.4
		Hauterivian								Cretaceous 2			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		Mapingian †	298.9
		Kasimovian			303.7							Mapingian †
		Kasimovian				305.9
		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					Red Downtonian/Temeside Shales/Downton Castle	Whitcliffe/Leintwardine		Silurian 2	419.2
	Pridoli					Red Downtonian/Temeside Shales/Downton Castle	Bringewood/Elton			421.3
	Ludlow	Ludfordian				Coalbrookdale	Wenlock (England)/Tickwood			423
		Gorstian								425.6
		Gorstian					Buildwas			426.4 *
	Wenlock	Homerian					Buildwas			427.4
		Homerian				Wych	Woolhope			428.4 *
		Sheinwoodian								430.5
	Llandovery	Telychian							Silurian 1	433.4
		Telychian								436.3 *
		Aeronian	438.5
		Aeronian	Cowleigh Park			439.3 *
		Rhuddanian	Cowleigh Park			440.8
Ordovician	Late Ordovician	Hirnantian				Ordovician 5		443.8
		Katian				Ordovician 5		445.2
		Sandbian				Ordovician 4		453
	Middle Ordovician	Darriwilian				Ordovician 3		458.4
	Middle Ordovician	Dapingian				Ordovician 2		467.3
	Early Ordovician	Floian				Ordovician 2		470
	Early Ordovician	Tremadocian				Ungurian		Ordovician 1	477.7
Cambrian	Furongian	Stage 10				Batyrbaian		Cambrian 5	485.4
		Jiangshanian				Batyrbaian			489.5
						Aksaian			490.7 *
						Sakian			492.2 *
		Paibian				Sakian			494
	Miaolingian	Guzhangian				Series 3 †		Ayusokkanian	Cambrian 4	497
		Guzhangian								499.5
		Drumian						Zhanaarykian		500.5
		Drumian						Tuesaian		503
		Wuliuan		Stage 5 †				Tuesaian	Cambrian 3	504.5
		Wuliuan		Stage 5 †						505.3
	Series 2	Stage 4								509
								Toyonian		510 *
								Botomian		512.5 *
		Stage 3						Botomian	Cambrian 2	514
		Stage 3						Atdabanian		515.6 *
	Terreneuvian	Stage 2						Tommotian		521
		Stage 2								525.5
		Fortunian							Cambrian 1	529
													538.8