The Carboniferous Limestone of the Country around Llandudno (North Wales)

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Abstract
I. G reat O rme's H ead . In Carboniferous Limestone, and the subdivisions into which it is divided in North Wales, were described in papers read before the British Association and the Liverpool Geological Society between the years 1870 and 1898. The most recent paper on ‘The Carboniferous Limestone of the Vale of Clwyd,’ is in the Proe. L'pool Geol. Soc. vol. viii, 1897-98. It contains a description of the subdivisions of the Limestone, including the Purple Sandstone, which consists of a series of sandstones and shales described by Mr. George Maw in 1865 as Permian, and more recently by Mr. Aubrey Strahan in 1890 as Coal Measures. The following table shows the subdivisions that occur in the Vale of Clwyd, and in two other areas previously described. The Purple Sandstone is shown to be on the horizon of the highest subdivision of the Carboniferous Limestone in Flintshire and Denbighshire:— The Great Orme's Head is a prominent headland on the seacoast of Caernarvonshire. It is separated from the mainland by an isthmus a mile in width and about 20 feet above Ordnance datum, and must have formed an island in post-Glacial times. Llandudno, the well-known watering-place, is situated on the southeast, and principally on the alluvial land. The Head is 2 miles in length from east to west, and 1 mile from north to south; it is bounded on the north and west by precipitous cliffs, which rise from the sea-level to an elevation of 200 or 300 feet. Along the southeastern side

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