PBDB Timescale

Ordovician of Britain

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
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
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

There are 14 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 4546 collections

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International Chronostratigraphic Timescale			Ordovician of Britain				Cambrian of Kazakhstan	Cambrian of North America		Cambrian Epochs
Ordovician	Late Ordovician	Hirnantian	Ashgill	Hirnantian							443.8
		Katian		Rawtheyan							445.2
				Cautleyan							448.9 *
				Pusgillian							449.3 *
			Caradoc	Streffordian	Onnian †						449.6 *
				Cheneyan							451.5 *
				Burrellian							452.7 *
		Sandbian									453
					Actonian †						453.2 *
					Marshbrookian †	Woolstonian †					454.2 *
					Longvillian †						455.2 *
				Aurelucian	Longvillian †						456.8 *
				Aurelucian	Soudleyan †/Harnagian/Costonian						457.4 *
	Middle Ordovician	Darriwilian	Llanvirn	Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn							458.4
		Darriwilian		Abereiddian/Early Llanvirn							461.3 *
		Dapingian		Abereiddian/Early Llanvirn							467.3
		Dapingian	Arenig	Fennian							468.4 *
	Early Ordovician	Floian		Fennian							470
				Whitlandian							471.1 *
				Moridunian							474.3 *
		Tremadocian	Tremadoc	Migneintian			Ungurian				477.7
			Tremadoc	Cressagian							480.8 *
											485 *
Cambrian	Furongian	Stage 10					Batyrbaian		Franconian †/Dresbachian/Millardan	Late Cambrian	485.4
		Stage 10						Sunwaptan			487.5
		Jiangshanian									489.5
							Aksaian				490.7 *
							Sakian				492.2 *
								Steptoean			493 *
		Paibian						Steptoean			494
	Miaolingian	Guzhangian					Ayusokkanian	Marjumian	Albertian †	Middle Cambrian	497
		Guzhangian									499.5
		Drumian					Zhanaarykian				500.5
		Drumian					Tuesaian				503
		Wuliuan					Tuesaian	Topazan			504.5
								Topazan			505.3
								Delamaran			506.5
	Series 2	Stage 4							Waucoban †	Early Cambrian	509
							Toyonian				510 *
							Toyonian	Dyeran			511 *
							Botomian				512.5 *
		Stage 3									514
								Montezuman			514.8 *
							Atdabanian	Montezuman			515.6 *
							Atdabanian	Begadean			519.9 *
	Terreneuvian	Stage 2					Tommotian				521
		Stage 2									525.5
		Fortunian									529
											538.8