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Cambrian--Ordovician Boundary Age and Duration of the Lowest Ordovician Tremadoc Series Based on U-Pb Zircon Dates from Avalonian Wales. Geological Magazine 137, 486-494., 2000.
New Uppermost Cambrian U-Pb Date from Avalonian Wales and Age of the Cambrian-Ordovician Boundary. Geological Magazine 135, 305-309., 1998.