Cay Sandstone or “Beach Rock” (10) Published February 17, 2013 at 2240 × 1700 in Cay Sandstone or “Beach Rock” Cay Sandstone or “Beach Rock” (10) – Broken slab of coral fragments cemented together in Cay Sandstone or “Beach Rock” on Normanby Island, one of the Frankland Islands, Queensland, Australia. P1180620aBlog10 About these ads