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The Cambrian Rocks of Arvon
Published online by Cambridge University Press: 01 May 2009
Extract
Some eight or nine tracts are now recognized. At Bangor there are two, and an isolated one at Carnarvon;the rest are in the Tregarth country. On the older one-inch maps, all of this was coloured as Cambrian, but during the “25-inch” survey, the greater part of it had to be transferred to Arvonian, reducing the Cambrian to a group of outliers.
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