The Geology of Mynydd-y-garn (Anglesey)

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Abstract
I. Introductory Above the village of Llanfair-y'nghornwy, in the north-west of Anglesey, stands a hill known as Mynydd-y-Garn or The Garn. Although rising to a height of less than 600 feet above Ordnance datum, it is one of the highest hills in the county, and is so well elevated above the surrounding country that from its crest the view embraces the greater part of the island, the Caernarvonshire mountains, and large expanses of sea. Ramsay in his memoir on the ‘Geology of North Wales’ makes but slight mention of the Garn, 1 merely noting that it lies in a much-faulted district. Prof. Blake gave a brief notice of the geology of the hill in his ‘Monian System of Rocks’; 2 and the present writer gave, incidentally, a further short account in a recent paper. 3 The results of a more detailed examination of the geological structure made during the past summer seem to warrant a more extended description than any hitherto made. II. Stratigraphy, and Description of the Rocks The mass of the hill consists of an inlier of sericitic and chloritic schistose phyllites, usually green, surmounted by a massive conglomerate, and surrounded by black slates and shales. The slates, apparently of Upper Llandeilo age, form, a strip about a mile in width, and are bounded both on the north-east and south-west by fractures which bring them against older rocks. A geologist making a traverse from Craig-y-gwynt over the hill in a north-north-westerly direction (see fig. 1, p. 22) and then north-north-eastward to

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