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44 GRANITES OF IRELAND. The Killiney granite in one or two places is dis tinctly foliated. 1 4. The granites of the north-east of Ireland lie in three distinct tracts of considerable extent, form ing the mountain ranges of Mourne, which attains in Slieve Donard an elevation of 2975 feet; of Carlingford, and of Slieve Croob. The granite of Mourne has been already partially described. 2 It forms a group of exceedingly pic turesque hills, generally of conical outline, with occa sional scarped cliffs and deep ravines. It is truly irruptive, and seems to Lave been intruded amongst the stratified rocks in a state bordering on solidity; and with a temperature only sufficient to indurate, but not to metamorphose, the Silurian rocks by which it is surrounded, and, in some places, surmounted. The granite of Mourne lias hitherto been used only to a very limited extent for building; and, owing to the numerous cavities it contains, and its distinct ively crystalline structure, it is probably not as well adapted to architectural purposes as the granite from the Newry district adjoining. Newry and Slieve Croob. This granite is alto gether different in texture and composition from that 1 A representation of the foliated granite is given by Mr. Du Noyer in the Explanation of Sheets 102 and 112 of the Geological Survey, P- 33- 2 First described by Dr. J. E. Berger in the Trans. Geol. Soc. Loud., first ser. vol. iii.