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 4547 collections

Show more time

Show linear time

International Chronostratigraphic Timescale			Ordovician of Britain				Cambrian of Kazakhstan	Cambrian Epochs	Cambrian of Britain
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	Late Cambrian	Merioneth	Dolgellian/Trempealeauan	485.4
		Stage 10								Festiniogian	489.2 *
		Jiangshanian									489.5
							Aksaian				490.7 *
							Sakian				492.2 *
										Maentwrogian	493.1 *
		Paibian								Maentwrogian	494
	Miaolingian	Guzhangian					Ayusokkanian	Middle Cambrian	St Davids		497
		Guzhangian									499.5
		Drumian					Zhanaarykian				500.5
		Drumian					Tuesaian				503
		Wuliuan					Tuesaian				504.5
		Wuliuan									505.3
	Series 2	Stage 4						Early Cambrian	Caerfai		509
							Toyonian				510 *
							Botomian				512.5 *
		Stage 3					Botomian				514
		Stage 3					Atdabanian				515.6 *
	Terreneuvian	Stage 2					Tommotian				521
		Stage 2									525.5
		Fortunian									529
											538.8