Free Pass Fridays Answer: March 15

Coquina is a sedimentary rock formed out of shells and sand over thousands of years of natural processes. It was a popular building material in Florida for many years, used to construct houses and warehouses, canals, tombstones and forts including the Castillo de San Marcos in St. Augustine. The GTM Research Reserve is home to a well made from coquina blocks. For more information on coquina and Florida history, check out the Florida Public Archaeology Network's Coquina Queries.