PBDB Timescale

Ordovician of China

The interval definitions in this timescale are derived from the following sources:

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
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
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

There are 9 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 98 collections

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International Chronostratigraphic Timescale			Ordovician of China			Cambrian of Kazakhstan	Ordovician of North America
Ordovician	Late Ordovician	Hirnantian	Hirnantian	Xiaoxita †/Shikou	Wufeng †		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						Chatfieldian				453
								Turinian				453.7 *
							Whiterockian		Canadian †	Chazyan †/Marmor		457 *
	Middle Ordovician	Darriwilian	Darriwilian	Guniu †/Hulo								458.4
		Darriwilian	Darriwilian	Hunjiang †	Dawan †/Daobaowan/Ningkuo							466.3 *
		Dapingian	Dapingian									467.3
		Dapingian	Dapingian					Rangerian				469.1 *
	Early Ordovician	Floian	Yiyangian				Ibexian	Blackhillsian		Jeffersonian †	Cassinian †	470
		Floian	Yiyangian					Tulean				473.9 *
		Tremadocian	Xinchangian			Ungurian						477.7
					Lianghekou †							477.9 *
								Stairsian				480.3 *
								Skullrockian			Demingian †	482 *
Cambrian	Furongian	Stage 10				Batyrbaian		Skullrockian				485.4
		Stage 10										487.5
		Jiangshanian										489.5
						Aksaian						490.7 *
						Sakian						492.2 *
		Paibian				Sakian						494
	Miaolingian	Guzhangian				Ayusokkanian						497
		Guzhangian										499.5
		Drumian				Zhanaarykian						500.5
		Drumian				Tuesaian						503
		Wuliuan				Tuesaian						504.5
		Wuliuan										505.3
	Series 2	Stage 4										509
						Toyonian						510 *
						Botomian						512.5 *
		Stage 3				Botomian						514
		Stage 3				Atdabanian						515.6 *
	Terreneuvian	Stage 2				Tommotian						521
												525.5