Cay Sandstone or “Beach Rock” (9) Published February 17, 2013 at 2240 × 1700 in Cay Sandstone or “Beach Rock” Cay Sandstone or “Beach Rock” (9) – Detailed close-up of the coral fragments naturally cemented together to form Cay sandstone or “Beach Rock” on Normanby Island, Queensland, Australia. P1180619aBlog9 About these ads