PBDB Timescale

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, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 view
F. M. Gradstein, J. G. Ogg, M. D. Schmitz and G. M. Ogg. 2020. Geologic Time Scale 2020 view
M. Kretzoi. 1942. Necroteuthis n. g. (Ceph. Dibr., Necroteuthidae N. F.) aus dem Oligozän von Budapest und das system der Dibranchiata. Földtani Közlöny 72:125-238 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
M. O. Woodburne. 1987. A prospectus of the North American Mammal Ages. In: Woodburne, M. O. (ed.), Cenozoic Mammals of North America. University of California Press, Berkelery, CA 285-290 view
J. Alroy. 2000. New methods for quantifying macroevolutionary patterns and processes. Paleobiology 26(4):707-733 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 126762 collections

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International Chronostratigraphic Timescale			Cambrian Epochs	Ordovician of North America					North American Mammal Subages/Zones			Cambrian of West Avalonia	Cenozoic Subepochs
Quaternary	Pleistocene	Late Pleistocene							Sheridanian				Late Pleistocene	0.0117
		Chibanian							Sheridanian				Middle Pleistocene	0.129
		Chibanian							Cudahyan/Sappan				Middle Pleistocene	0.21
		Calabrian							Cudahyan/Sappan				Early Pleistocene	0.774
		Calabrian							Senecan/Rexroadian					1.4
		Gelasian												1.8
Neogene	Pliocene	Piacenzian											Late Pliocene	2.58
		Zanclean											Early Pliocene	3.6
		Zanclean							Late Hemphillian/late Early Hemphillian/early Early Hemphillian				Early Pliocene	4.7
	Miocene	Messinian											Late Miocene	5.333
		Tortonian												7.246
		Tortonian							Late Clarendonian/Early Clarendonian					9.4
		Serravallian							Late Clarendonian/Early Clarendonian				Middle Miocene	11.63
		Serravallian							late Late Barstovian/early Late Barstovian/Early Barstovian					12.5
		Langhian												13.82
		Burdigalian											Early Miocene	15.98
									Late Hemingfordian/Early Hemingfordian					16.3
									late Late Arikareean/early Late Arikareean/late Early Arikareean/early Early Arikareean	Harrisonian				18.5
		Aquitanian												20.44
Paleogene	Oligocene	Chattian											Late Oligocene	23.03
										Monroecreekian				23.1 *
										Geringian				24.7 *
		Rupelian								Geringian			Early Oligocene	27.82
		Rupelian											Early Oligocene	29.5
	Eocene	Priabonian							Late Chadronian/Middle Chadronian/Early Chadronian				Late Eocene	33.9
		Priabonian											Late Eocene	37
		Bartonian											Middle Eocene	37.71
		Bartonian							Late Uintan/Early Uintan					39.7
		Lutetian							Late Uintan/Early Uintan					41.2
		Lutetian							Twinbuttean/Blacksforkian/Gardnerbuttian					46.2
		Ypresian							Twinbuttean/Blacksforkian/Gardnerbuttian				Early Eocene	47.8
									Lostcabinian/Lysitean/Graybullian/Sandcouleean					50.5
											Cf3/Cf2/Cf1			54.9
	Paleocene	Thanetian									Cf3/Cf2/Cf1		Late Paleocene	56
		Thanetian									Ti6/Ti5/Ti4/Ti3/Ti2/Ti1		Late Paleocene	56.2
		Selandian									Ti6/Ti5/Ti4/Ti3/Ti2/Ti1		Middle Paleocene	59.2
		Selandian									To3/To2/To1		Middle Paleocene	60.9
		Danian									To3/To2/To1		Early Paleocene	61.6
		Danian									Pu3/Pu2/Pu1		Early Paleocene	63.8
Cretaceous	Late Cretaceous	Maastrichtian												66
		Campanian												72.1
		Santonian												83.6
		Coniacian												86.3
		Turonian												89.8
		Cenomanian												93.9
	Early Cretaceous	Albian												100.5
		Aptian												113
		Barremian												121.4
		Hauterivian												125.77
		Valanginian												132.6
		Berriasian												139.8
Jurassic	Late Jurassic	Tithonian												145
		Kimmeridgian												149.2
		Oxfordian												154.8
	Middle Jurassic	Callovian												161.5
		Bathonian												165.3
		Bajocian												168.2
		Aalenian												170.9
	Early Jurassic	Toarcian												174.7
		Pliensbachian												184.2
		Sinemurian												192.9
		Hettangian												199.5
Triassic	Late Triassic	Rhaetian												201.4
		Norian												208.5
		Carnian	227
	Middle Triassic	Ladinian	237
	Middle Triassic	Anisian	242
	Early Triassic	Olenekian	247.2
	Early Triassic	Induan	251.2
Permian	Lopingian	Changhsingian	251.902
	Lopingian	Wuchiapingian	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	Famennian	Wocklum/Dasberg/Hemberg/Nehden	358.9
	Late Devonian	Frasnian	Frasnian	Adorf	372.2
	Middle Devonian	Givetian	Givetian	Givetian	382.7
	Middle Devonian	Eifelian	Couvinien	Eifelian	387.7
	Early Devonian	Emsian		Emsian	393.3
		Pragian		Siegen	407.6
		Pragian	Coblencien	Siegen	408.2 *
		Lochkovian	Gedinnine	Gedinnine	410.8
Silurian	Pridoli				Ohesaare	419.2
	Pridoli				Kaugetuma	421.7 *
	Ludlow	Ludfordian			Kuressaare	423
		Ludfordian			Paadla	423.4 *
		Gorstian			Paadla	425.6
	Wenlock	Homerian			Rootsikula	427.4
		Homerian			Jaagarahu	429.2 *
		Sheinwoodian			Jaagarahu	430.5
		Sheinwoodian			Jaani	431.8 *
	Llandovery	Telychian			Jaani	433.4
		Telychian			Adavere	434 *
		Aeronian			Adavere	438.5
		Aeronian			Raikkula	439.4 *
		Rhuddanian			Raikkula	440.8
		Rhuddanian			Juuru	441.4 *
Ordovician	Late Ordovician	Hirnantian			Cincinnatian	Gamachian	443.8
		Katian				Gamachian	445.2
						Richmondian	446 *
						Maysvillian	Rocklandian †/Shermanian/Ashbyan/Kirkfieldian/Blackriveran/Wildernessian/Trentonian/Franklinian	449.8 *
						Edenian		450.4 *
					Mohawkian	Chatfieldian		451.1 *
		Sandbian				Chatfieldian		453
						Turinian		453.7 *
					Whiterockian		Canadian †	Chazyan †/Marmor	457 *
	Middle Ordovician	Darriwilian							458.4
		Dapingian							467.3
		Dapingian				Rangerian			469.1 *
	Early Ordovician	Floian			Ibexian	Blackhillsian		Jeffersonian †	Cassinian †	470
		Floian				Tulean				473.9 *
		Tremadocian				Tulean				477.7
						Stairsian				480.3 *
						Skullrockian			Demingian †	482 *
Cambrian	Furongian	Stage 10				Skullrockian	Late Cambrian				485.4
		Stage 10									487.5
		Jiangshanian									489.5
		Paibian									494
	Miaolingian	Guzhangian					Middle Cambrian				497
		Guzhangian									Arcadian	498.4
		Drumian										500.5
		Wuliuan										504.5
	Series 2	Stage 4					Early Cambrian				Branchian	509
		Stage 3									Branchian	514
		Stage 3									Placentian	517.1
	Terreneuvian	Stage 2										521
	Terreneuvian	Fortunian										529
														538.8