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    The rocks of the county, if duly examined, and rendered freely accessible for purposes of export, would probably be found extensively productive in useful stones, earths, and metals: and, even under the very limited inspection are known to possess sufficient wealth to attract the special attention of the economist.
    Limestone, of very various texture, yet generally rich enough in carbonate to be an excellent manure, might be worked in almost every part of the great limestone district; limestone gravel also is comparatively abundant, and forms a ready manure; and, in places where its scarcity combines with its manurial value to render it specially noticeable, it occurs of the following varieties: reddish limestone, in Glenomera, barony of Tulla, ... glimmery black limestone, near Six-mile-Bridge, black fossiliferous limestone, and black schistose or laminated limestone, in the glen of the Slieve-an-Oir rivulet, which runs on the boundary with Galway.
    Lead ore, in some instances apparently rich and abundant, occurs on the Colpoys estate near Tulla, on the lands of Class ... and in Glendree near Feacle iron ore variously in the stone near Spansel Hill.
    ... the eastern or Slieve Baughta mountainous district, consists of moor or bog, varying in depth from two inches to many feet, and lying upon a ferruginous clay, or upon sandstone rock.

    Parliamentary gazetteer of Ireland, 1846

    Detail from the Lizars map of Ireland (1831).
    Above: detail from the Lizars map of Ireland (1831).
    Map © Cartography Associates, from the Rumsey Collection.

    Left: detail from satellite photo (click for larger version).

    Charon (MIT Project) 1989, James Coleman ©