Cay Sandstone or “Beach Rock” Published February 17, 2013 at 2239 × 1698 in Cay Sandstone or “Beach Rock” Layers of “Beach Rock” or Cay Sandstone recently formed by a natural cementation of coral and shell fragments in still shallow water at the edge of Normanby Island, one of the Frankland Islands, Queensland, Australia. P1160254aBlog About these ads