Page:Transactions of the Geological Society, 1st series, vol. 1.djvu/282

 its eastern and western sides by incumbent rocks of great variety; the structure and relations of which, as well as of the granitic mass, are in many places very distinctly exhibited.

Within this mountainous district, distinguished by the interesting and beautiful scenery which it presents, are found the copper mines of Cronebane and Ballymurtagh; and the lead mines of Glenmalur; the veins of lead ore at Dalkey, and that near the Scalp also belong to it. The stream works commonly called the Gold mine, at the mountain Croghan Kinshela are on the southern range of this district and of the County of Wicklow; and gold has been found within it, at another mountain also named Croghan, about seven miles to the northward of that place.

The occurrence of tinstone at the “ Gold-mine,” where it has been obtained in fragments, is a fact which deserves attention; for from the great extent of primitive country in the Wicklow mountains, the probability of finding veins of tinstone there, appears consider sable. Porcelain earth in purity equal to the “ China clay” of Cornwall, has been found in the lands of Kilranelagh, on the south-western side of this county; and granite in a state of decomposition is found so extensively in other parts of it, that this valuable production may very probably be obtained there in considerable quantity.

The country around the village of Bray, at the distance of ten miles from Dublin, presents within a small space an instructive series of rocks; and the appearances observable at Killiney, first noticed I believe by Dr. Blake of Dublin, particularly deserve attention. Schistose