The town of Oswestry is situated upon and near the southern termination of the North Wales Coal Field, which extends a little farther south of the town, and, north-west, through Ruabon, Brymbo, Flint, Mostyn, and on to the sea, near the Great Ormshead. Running parallel, and lying at the back, or to the west of these coal-measures, is the great belt of mountain limestone, commencing at Llanymynech Hill, and extending also, north-westerly, to the Ormshead, and from thence dipping into the sea. The metalliferous character of the district is distinguished for the production of lead, copper, and zinc. Trials have been made for minerals at Treflach Wood, and portions of carbonate and sulphuret of copper, of average qualities, have been found, but not in sufficient quantities to justify extended operations. At Llanymynech Hill both copper and lead, sulphurets and carbonates, with carbonate of zinc, or calamine, have been raised in large quantities by various companies, and occasionally the ores have reached a high per centage, ranging from five to twenty-five per cent. The ores are found in beds or flats, at from thirty to fifty yards from the surface, and lying between, and running parallel with, the strata of limestone that inclose them. It is an extraordinary fact, that the metalliferous belt of limestone abruptly terminates at the south end of the hill, and cannot be traced farther. Proceeding west, at the back of Oswestry, in Treflach Wood, there are some fine beds of Derbyshire marble or entrochal limestone, that have been worked for mantle-pieces and other ornamental purposes. Trials have been made, and small quantities of lead and copper found in this limestone belt, extending to Minera, including the Eglwyseg range which bounds a portion of the Vale of Llangollen, near to Ruabon. The Minera district is too well known for its rich mineral products, especially of lead and zinc, to require particular notice, and the same may be said of the Mold, Halkin, and Holywell mineral formation, passing on with continued fine mineral deposits, to Talargoch, near Prestatyn, in Flintshire. The coal-measures in the district of Oswestry abound in fossils, _Lepidodendrons_, _Sigillaria_, _Stigmaria_, and _Calamites_, &c.; and the carboniferous limestone is much more prolific of that class of fossiliferous productions which usually accompany the old mountain limestone.