The stratigraphic ranges for the British stages of the Ordovician.
A matrix containing the start and end ages for the British stage subdivisions of the Ordovician.
Webby, B.D., Paris, F., Droser, M.L., and Percival, I.G. (editors), 2004. The Great Ordovician Biodiversity Event. Columbia University Press, New York, 496 pp.
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