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, 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
F. M. Gradstein, J. G. Ogg, M. D. Schmitz and G. M. Ogg. 2020. Geologic Time Scale 2020 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			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				Late Maastrichtian/Early Maastrichtian		66
		Campanian				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				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	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