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    The Silurian. The rocks of this System occur inside a series of inliers surrounded by Old Red Sandstone, dotted about in the wide area of Carboniferous strata of the North-eastern and Central parts of the Province, in the area of Clogher on the west, and of Waterford to the east. The following areas demand description: Lough Graney, Slieve Bernagh, the Silvermine Mountains, Slieve-Felim, and the Devil's Bit; Slieve Galty; Slievenaman; The Comeragh Mountains; Clogher Head and Dingle.
    Everywhere the rocks are green, grey, or blue grits, slates, and flags, with beds of sandstone, rare limestones, and black slates. The slates are especially quarried and utilized in Clare, Cork, Kerry, and Tipperary. At Lough Graney the beds answer this description; they are imperfectly cleaved, and, about Scalpnagown, contain beds of volcanic ash and breccia, and masses of felsite, andesite, and amygdaloidal diabase, some of which are intrusive, but others are undoubtedly lavas of contemporaneous date. No fossils have hitherto been found in these rocks, and their exact age is unknown. In the Slieve Bernagh range occur compact green grits, purple and green slates, quartzo-felspathic sandstones, with olive and red clay rocks; fossils are fairly abundant.

    A McHenry & WW Watts, 1895

    Detail from the Moll map of Ireland, 1736.
    Above: detail from the Moll map of Ireland, 1736.
    Map © Cartography Associates, from the Rumsey Collection.

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

    Charon (MIT Project) 1989, James Coleman ©