The impressive cliffs, like impregnable vertical walls, of the Isle of Staffa, Inner Hebrides (Scotland).
Isle of Staffa (from the Old Norse for stave or pillar island) is a small and uninhabited of the Inner Hebrides of Scotland.
Entirely of volcanic origin, the isle consists of a basement of tuff, underneath colonnades of a black fine-grained Tertiary basalt, overlying which is a third layer of basaltic lava lacking a crystalline structure. By contrast, slow cooling of the second layer of basalt resulted in an extraordinary pattern of predominantly hexagonal columns which form the faces and walls of the principal caves.The lava contracted towards each of a series of equally spaced centres as it cooled and solidified into prismatic columns. Similar formations are found at the Giant’s Causeway In Ireland.