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Cliffs of Moher, Ireland, September 1999
       
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    | Sandstone is more
      resistant to erosion than siltstone, and stick out from the
      cliff-face compared with the intervening layers of siltstone. One of these
      sandstone forms the platform below the path at the viewing point.  
      The sediments that now form the rock of the
      cliffs were originally deposited on an ancient sea-bed some 320 million
      years ago. The shore of the sea is quite a distance away to the north. 
      Rivers flowing off the land deposit their sediment into the sea in a series
      of deltas. |  
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