Coquina, tiny shells, is a natural seashell rock found in St. Augustine. The Castillo is the most significant building using this stone, but in St. Augustine 1st, the one remaining British building and 2nd period Spanish buildings are made of coquina. The Island itself was originally called La isla de la cantera (Quarry island) before it was named Anastasia Island. The rock was cut by hand and moved to Quarry creek and floated across the bay to the Castillo and city.[url]http://www.drbronsontours.com/bronsoncoquina.html[/url]