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
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, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 view
F. M. Gradstein, F. P. Agterberg, J. G. Ogg, J. Hardenbol, P. Van Veen, J. Thierry, and Z. Huang. 1995. A Triassic, Jurassic, and Cretaceous time scale. SEPM Special Publication 54 view
J. Palfy, P. L. Smith, and J. K. Mortensen. 2000. A U-Pb and 40Ar/39Ar time scale for the Jurassic. Canadian Journal of Earth Sciences 37(6):923-944 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 Kazakhstan	Cretaceous North American Land-Mammal Ages	Carboniferous of North America	Mesozoic Subages
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					Lancian/Edmontonian		Late Maastrichtian/Early Maastrichtian		66
		Campanian					Judithian/Aquilan		Late Campanian/Middle Campanian/Early Campanian		72.1
		Santonian							Late Santonian/Middle Santonian/Early Santonian		83.6
		Coniacian							Late Coniacian/Middle Coniacian/Early Coniacian		86.3
		Turonian							Late Turonian/Middle Turonian/Early Turonian		89.8
		Cenomanian							Late Cenomanian/Middle Cenomanian/Early Cenomanian		93.9
	Early Cretaceous	Albian							Late Albian		100.5
									Middle Albian		106.2 *
									Early Albian		109.9 *
		Aptian							Late Aptian		113
		Aptian							Early Aptian		119.5 *
		Barremian							Late Barremian/Early Barremian		121.4
		Hauterivian							Late Hauterivian/Early Hauterivian		125.77
		Valanginian							Late Valanginian/Early Valanginian		132.6
		Berriasian							Late Berriasian		139.8
									Middle Berriasian		140.6 *
									Early Berriasian		142.7 *
Jurassic	Late Jurassic	Tithonian							Late Tithonian	Middle Tithonian	145
		Tithonian							Early Tithonian	Middle Tithonian	146.3 *
		Kimmeridgian							Late Kimmeridgian		149.2
		Kimmeridgian							Early Kimmeridgian		152.2 *
		Oxfordian							Late Oxfordian	Middle Oxfordian/Early Oxfordian	154.8
		Oxfordian								Middle Oxfordian/Early Oxfordian	157.9 *
	Middle Jurassic	Callovian							Late Callovian/Middle Callovian/Early Callovian		161.5
		Bathonian							Late Bathonian/Middle Bathonian/Early Bathonian		165.3
		Bajocian							Late Bajocian		168.2
		Bajocian							Early Bajocian		168.6 *
		Aalenian							Late Aalenian/Middle Aalenian/Early Aalenian		170.9
	Early Jurassic	Toarcian							Late Toarcian		174.7
									Middle Toarcian		180.4 *
									Early Toarcian		182.9 *
		Pliensbachian							Late Pliensbachian/Early Pliensbachian		184.2
		Sinemurian							Late Sinemurian/Early Sinemurian		192.9
		Hettangian							Late Hettangian/Middle Hettangian/Early Hettangian		199.5
Triassic	Late Triassic	Rhaetian									201.4
		Norian							Sevatian		208.5
									Alaunian		213.2 *
									Lacian		216.7 *
		Carnian							Tuvalian		227
		Carnian							Julian		233.4 *
	Middle Triassic	Ladinian							Longobardian		237
		Ladinian							Fassanian		239.7 *
		Anisian							Illyrian		242
									Pelsonian		243.8 *
									Bithynian		244.7 *
									Aegean		245.5 *
	Early Triassic	Olenekian							Spathian		247.2
		Olenekian		Smithian	248.9 *
		Induan		Dienerian	251.2
		Induan		Griesbachian	251.4 *
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				Bursumian †		293.52
Carboniferous	Pennsylvanian	Gzhelian				Virgilian		298.9
		Kasimovian				Missourian		303.7
		Kasimovian				Desmoinesian		305.9 *
		Moscovian				Desmoinesian		307
		Moscovian				Atokan		312.7 *
		Bashkirian	315.2			Atokan
		Bashkirian	Morrowan			318.4 *
	Mississippian	Serpukhovian	Chesterian			323.2
		Visean	Chesterian			330.9
			Meramecian			335.8 *
			Osagean			343.1 *
		Tournaisian	Osagean			346.7
		Tournaisian	Kinderhookian			351.9 *
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				443.8
		Katian				445.2
		Sandbian				453
	Middle Ordovician	Darriwilian				458.4
	Middle Ordovician	Dapingian				467.3
	Early Ordovician	Floian				470
	Early Ordovician	Tremadocian				Ungurian	477.7
Cambrian	Furongian	Stage 10				Batyrbaian	485.4
		Jiangshanian				Batyrbaian	489.5
						Aksaian	490.7 *
						Sakian	492.2 *
		Paibian				Sakian	494
	Miaolingian	Guzhangian				Series 3 †	Ayusokkanian	497
		Guzhangian						499.5
		Drumian					Zhanaarykian	500.5
		Drumian					Tuesaian	503
		Wuliuan			Stage 5 †		Tuesaian	504.5
		Wuliuan			Stage 5 †			505.3
	Series 2	Stage 4						509
							Toyonian	510 *
							Botomian	512.5 *
		Stage 3					Botomian	514
		Stage 3					Atdabanian	515.6 *
	Terreneuvian	Stage 2					Tommotian	521
											525.5