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. F. Steininger, W. A. Berggren, D. V. Kent, R. L. Bernor, S. Sen and J. Agusti. 1996. Circum-Mediterranean Neogene (Miocene and Pliocene) marine-continental chronologic correlations of European mammal units. The Evolution of Western Eurasian Neogene Mammal Faunas (eds. R. L. Bernor, V. Fahlbusch, and H.-W. Mittmann) view
F. M. Gradstein, J. G. Ogg, M. D. Schmitz and G. M. Ogg. 2020. Geologic Time Scale 2020 view
B. D. Webby. 1998. Steps toward a global standard for Ordovician stratigraphy. Newsletters in Stratigraphy 36:1-33 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
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

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 126844 collections

Show more time

Show linear time

International Chronostratigraphic Timescale			Ordovician of China			Ten Million Year Bins	Ordovician of North America
Ordovician	Late Ordovician	Hirnantian	Hirnantian	Xiaoxita †/Shikou	Wufeng †	Ordovician 5	Cincinnatian	Gamachian				443.8
		Katian	Chientangkiangian					Gamachian				445.2
			Chientangkiangian					Richmondian				446 *
			Neichianshanian/Hanjiang					Richmondian				449.5
								Maysvillian	Rocklandian †/Shermanian/Ashbyan/Kirkfieldian/Blackriveran/Wildernessian/Trentonian/Franklinian			449.8 *
								Edenian				450.4 *
							Mohawkian	Chatfieldian				451.1 *
		Sandbian				Ordovician 4		Chatfieldian				453
								Turinian				453.7 *
							Whiterockian		Canadian †	Chazyan †/Marmor		457 *
	Middle Ordovician	Darriwilian	Darriwilian	Guniu †/Hulo		Ordovician 3						458.4
		Darriwilian	Darriwilian	Hunjiang †	Dawan †/Daobaowan/Ningkuo	Ordovician 3						466.3 *
		Dapingian	Dapingian			Ordovician 2						467.3
		Dapingian	Dapingian					Rangerian				469.1 *
	Early Ordovician	Floian	Yiyangian				Ibexian	Blackhillsian		Jeffersonian †	Cassinian †	470
		Floian	Yiyangian					Tulean				473.9 *
		Tremadocian	Xinchangian			Ordovician 1						477.7
					Lianghekou †							477.9 *
								Stairsian				480.3 *
								Skullrockian/Demingian				482 *
												485.4
												487.5