On the Metamorphic Series between Twt Hill (Caernarvon) and Port Dinorwig

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Abstract
This interesting group, which on the map of the Geological Survey is not divided from the “quartz-porphyry,” has already been briefly noticed by Prof. Hughes and Dr. Hicks. They assert that the rock is not igneous, and lithologically much resembles the Dimetian of St. David's. That view is fully borne out by our observations, which, we venture to think, prove conclusively that there is here a series of metamorphic rocks much older than the quartz-felsites and conglomerates described in the last paper.

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