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
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
F. M. Gradstein, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 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

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.

This timescale is used in the definition of 126689 collections

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International Chronostratigraphic Timescale			North American Mammal Subages/Zones			Cenozoic Subepochs
							18.5
Paleogene	Oligocene	Chattian	late Late Arikareean/early Late Arikareean/late Early Arikareean/early Early Arikareean	Harrisonian		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
							66