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The Quarterly journal of the Geological Society of London . M'KENNY HUGHES OST THE GEOLOGY OE ANGLESEY The beds from Pwllgoch to Caemawr are probably Arenig lower most Bala of some At Pwllgoch we have the ironstone so charac teristic of Arenig and at Caemawr we find Arenig Graptolites see Where the dykes cross the series at