Cay Sandstone or “Beach Rock” (11) Published February 17, 2013 at 2240 × 1700 in Cay Sandstone or “Beach Rock” Cay Sandstone or “Beach Rock” (11) – Close-up of the coral fragments cemented together in a broken slab of Cay Sandstone or “Beach Rock” on Normanby Island, one of the Frankland Islands, Queensland, Australia. P1180622aBlog11 About these ads