SLATES OF GREAT BRITAIN. 295 Nearest Railway Buildings in which used, and Name of Quarry. Station or Name of Stone. Purposes to which applied, Shipping Port. and Remarks. CARNARVONSHIRE. Bangor Braichrhydd Bangor Carnarvon .. ,. .. Slate Roofing slates and slabs. Bwlch-y-Gwes Cofn-du tt tt Cilgwyn »» >* tt tt Cloddfar Ldn »» »» •••••• Cvrcn Eigia Tal-y-Cafn it •••••• Roofing slate. Roofing slate, slabs, &c. Dinorwic Port Dinorwic .. Carnarvon .. Dorothea Glynrhouwy tt a Roofing slate. »» Gorseddan Portmadon . . »» Hafodlas tt Moel Tryfan »» Pantdreiniog *> 1* * Penmachno Trefriw & Conway Bangor Carnarvon f» •••••• Roofing slates and slabs. »» »» Penrhyn Penorsedd Talysam tt Slate and slab Slate Tymawr tl Tyn-y-worglodd "Vron tt (c) Cornwall. The Delabole quarries, from strata belonging to the Devonian formation, have been worked for a long period. The colour of the slates is grey or blue, and they are shipped from Tintagel, and Boscastle. The Wellington College at Sand hurst is roofed with Delabole slate. 1 The Tavistock slates from Devonshire were once in much demand; 1 De la Beche, Geological Rep. of Devon and Cornwall, p. 502 (i839)-