On the Pre-Cambrian (Dimetian, Arvonian, and Pebidian) Rocks in Caernarvonshire and Anglesey

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Abstract
Conclusions: Collectively, these additions to the Pro-Cambrian areas hitherto known are large and important, and many of them were not in the slightest degree suspected until we commenced our researches amongst them a few years since. Of others, especially some of the rocks in Anglesey, Professors Sedgwick and Phillips many years ago expressed the opinion that they were older than the Cambrian rocks. These views, however, did not receive much support from geologists, but were for the time crushed by the combined weight of authority vested in the Geological Survey as represented by its chiefs, who all declared that these must be altered Cambrian and Silurian rocks only. Consequently they were so marked on the geological maps, and still remain so.

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