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. Freudenthal. 2006. Mammal Paleogene zones. personal communication 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
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 126700 collections

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