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. Harzhauser and W. E. Piller. 2004. Integrated stratigraphy of the Sarmatian (Upper Middle Miocene) in the western Central Paratethys. Stratigraphy 1(1):65-86 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
D. H. Erwin and S. A. Bowring. 2004. Cambrian time scale. view
F. M. Gradstein, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 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 125968 collections

Show more time

Show linear time

International Chronostratigraphic Timescale			Ordovician of Australia	Cambrian of Siberia	Ordovician of North America					Ordovician of Ibero-Bohemia
Ordovician	Late Ordovician	Hirnantian	Bolindian		Cincinnatian	Gamachian				Kosovian				443.8
		Katian				Gamachian				Kralodvorian	Bohdalec †			445.2
						Richmondian								446 *
			Eastonian											449 *
										Berounian				449.7 *
						Maysvillian	Rocklandian †/Shermanian/Ashbyan/Kirkfieldian/Blackriveran/Wildernessian/Trentonian/Franklinian							449.8 *
						Edenian								450.4 *
					Mohawkian	Chatfieldian								451.1 *
			Gisbornian											452 *
		Sandbian												453
						Turinian								453.7 *
						Turinian						Zahorany †/Vinice	Letna †	456.2 *
					Whiterockian		Canadian †	Chazyan †/Marmor				Zahorany †/Vinice		457 *
											Liben †			458 *
	Middle Ordovician	Darriwilian	Darriwilian											458.4
										Dobrotivian				458.5 *
										Oretanian				459.7 *
											Sarka †			461.7 *
		Dapingian	Yapeenian								Klabava †			467.3
			Yapeenian							Arenigian				468
			Castlemainian											468.5 *
			Castlemainian			Rangerian								469.1 *
	Early Ordovician	Floian	Chewtonian		Ibexian	Blackhillsian		Jeffersonian †	Cassinian †					470
			Bendigonian											471.8 *
			Lancefieldian											473.5 *
						Tulean								473.9 *
		Tremadocian				Tulean				Tremadocian				477.7
						Stairsian								480.3 *
						Skullrockian/Demingian								482 *
			Warendian											482.8 *
			Warendian	Mansian †										483.55 *
														485.4
														487.5