PBDB Interval

International Chronostratigraphic Timescale

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

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
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
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
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

There are 59 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 126701 collections

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International Chronostratigraphic Timescale					Ammonite Chrons of Northwest Europe		Mesozoic Subages
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					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			Parkinsoni/Garantiana/Subfurcatum/Sauzei/Laeviuscula/Discites		Late Bajocian		168.2
						Humphresianum	Late Bajocian		168.4
						Humphresianum	Early Bajocian		168.6 *
		Aalenian			Concavum/Murchisonae/Opalinum		Late Aalenian/Middle Aalenian/Early Aalenian		170.9
	Early Jurassic	Toarcian			Levesquei/Variabilis/Bifrons	Thouarsense	Late Toarcian		174.7
							Late Toarcian		180.1
							Middle Toarcian		180.4 *
					Serpentinum/Falciferum/Tenuicostatum		Middle Toarcian		182
					Serpentinum/Falciferum/Tenuicostatum		Early Toarcian		182.9 *
		Pliensbachian			Spinatum/Margaritatus/Davoei/Ibex/Jamesoni		Late Pliensbachian/Early Pliensbachian		184.2
		Sinemurian			Raricostatum/Oxynotum/Obtusum/Turneri/Semicostatum/Bucklandi		Late Sinemurian/Early Sinemurian		192.9
		Hettangian			Angulata/Liasicus/Planorbis		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 *
									251.902