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
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
M. Freudenthal. 2006. Mammal Paleogene zones. personal communication 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. Meng and M. C. McKenna. 1998. Faunal turnovers of Paleogene mammals from the Mongolian Plateau. Nature 394:364-367 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 126610 collections

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International Chronostratigraphic Timescale			North American Mammal Subages/Zones			Mammal Paleogene Zones		Paleogene Mammal Ages of Asia
										18.5
Paleogene	Oligocene	Chattian	late Late Arikareean/early Late Arikareean/late Early Arikareean/early Early Arikareean	Harrisonian		MP 30/MP 29/MP 28/MP 27/MP 26	MP 25	Tabenbulakian	Hsandagolian	23.03
				Monroecreekian						23.1 *
				Geringian						24.7 *
		Rupelian		Geringian		MP 24/MP 23/MP 22/MP 21		Kekeamuan		27.82
		Rupelian				MP 24/MP 23/MP 22/MP 21		Kekeamuan		29.5
	Eocene	Priabonian	Late Chadronian/Middle Chadronian/Early Chadronian			MP 20/MP 19/MP 18/MP 17B/MP 17A		Houldjinian/Ergilian/Ulangochuian		33.9
		Priabonian				MP 20/MP 19/MP 18/MP 17B/MP 17A		Houldjinian/Ergilian/Ulangochuian		37
		Bartonian				MP 16		Sharamurunian/Irdinmanhan/Arshantan		37.71
		Bartonian	Late Uintan/Early Uintan			MP 16				39.7
		Lutetian	Late Uintan/Early Uintan			MP 15/MP 14/MP 13/MP 12/MP 11				41.2
		Lutetian	Twinbuttean/Blacksforkian/Gardnerbuttian			MP 15/MP 14/MP 13/MP 12/MP 11				46.2
		Ypresian	Twinbuttean/Blacksforkian/Gardnerbuttian			MP 10/MP 8 + 9/MP 7			Bumbanian	47.8
			Lostcabinian/Lysitean/Graybullian/Sandcouleean							50.5
					Cf3/Cf2/Cf1					54.9
	Paleocene	Thanetian			Cf3/Cf2/Cf1	MP 6	MP 1 - 5	Gashatan		56
		Thanetian			Ti6/Ti5/Ti4/Ti3/Ti2/Ti1	MP 6		Gashatan		56.2
		Selandian			Ti6/Ti5/Ti4/Ti3/Ti2/Ti1					59.2
		Selandian			To3/To2/To1					60.9
		Danian			To3/To2/To1					61.6
		Danian			Pu3/Pu2/Pu1					63.8
										66