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    The Old Red Sandstone is magnificently developed in the south-west of Ireland, supporting first the Carboniferous Slate, or Devonian form of the Carboniferous Limestone; then the Carboniferous Limestone itself, in its various modifications, as we trace it from south to north.
    The Old Red Sandstone, however, dies away as we proceed from S. W. to N. E., until in Carlow, Kildare, and Dublin, the Carboniferous limestone rests directly on the Old Granitic and Silurian floor, with only two or three occasional small patches of Red Sandstone and conglomerate at its base, which can be assigned to the Old Red Sandstone. On the west the Old Red Sandstone retains more of its southern importance up to the latitude of Galway Bay. It is well seen on the flanks of Slieve Bloom and Slieve Aughta, where it is still several hundred feet thick. These are obviously the upper beds only of the Cork and Kerry Old Red, the lower thousands of feet having never been deposited on the north.

    J. Beete Jukes, 1866

    Detail from the Cary map of Ireland, 1799.
    Above: detail from the Cary map of Ireland, 1799.
    Map © Cartography Associates, from the Rumsey Collection.

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

    Charon (MIT Project) 1989, James Coleman ©