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
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
F. M. Gradstein, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 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
D. H. Erwin and S. A. Bowring. 2004. Cambrian time scale. 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 127057 collections

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International Chronostratigraphic Timescale			Ordovician of the Baltic				Cambrian of Siberia	Cambrian of Kazakhstan	Ten Million Year Bins	Ordovician of North America
Ordovician	Late Ordovician	Hirnantian	Harju	Porkuni					Ordovician 5	Cincinnatian	Gamachian				443.8
		Katian		Pirgu							Gamachian				445.2
				Pirgu							Richmondian				446 *
				Vormsi							Richmondian				449.6 *
				Vormsi							Maysvillian	Rocklandian †/Shermanian/Ashbyan/Kirkfieldian/Blackriveran/Wildernessian/Trentonian/Franklinian			449.8 *
				Nabala	Johvi †						Maysvillian				450 *
				Nabala							Edenian				450.4 *
			Viru	Rakvere							Edenian				450.6 *
				Rakvere						Mohawkian	Chatfieldian				451.1 *
				Oandu											452 *
		Sandbian		Keila	Idavere †				Ordovician 4						453
				Keila							Turinian				453.7 *
				Haljala											453.9
				Kukruse											456.4 *
				Kukruse						Whiterockian		Canadian †	Chazyan †/Marmor		457 *
				Uhaku	Aluoja †										457.5 *
	Middle Ordovician	Darriwilian		Uhaku					Ordovician 3						458.4
				Lasnamagi											458.9 *
				Aseri											460.4 *
			Oeland	Kunda											462.9 *
				Kunda	Valaste †/Hunderum										464.3 *
				Volkhov		Langevoja †/Vaana/Saka									467.1 *
		Dapingian							Ordovician 2						467.3
											Rangerian				469.1 *
				Billingen							Rangerian				469.3 *
	Early Ordovician	Floian								Ibexian	Blackhillsian		Jeffersonian †	Cassinian †	470
					Latorp †										470.1 *
				Hunneberg											473.7 *
											Tulean				473.9 *
		Tremadocian						Ungurian	Ordovician 1		Tulean				477.7
											Stairsian				480.3 *
				Varangu							Stairsian				481.3 *
				Varangu							Skullrockian/Demingian				482 *
				Pakerort											482.2 *
				Pakerort			Mansian †								483.55 *
															485.4 *
															486.3
															486.5
															487.5