This is a close-up of coquina limestone. This type of limestone was used to construct Castillo de San Marcos. It is composed primarily of shells that have been cemented together by calcium carbonate. The fort is a National Monument, and is listed on the National Register of Historic Places.Galleries:Castillo de San Marcos, Forts and Fortifications, St. Augustine, St. JohnsKeywords:castillo de san marcos, coquina, coquina limestone, fort marion, saint augustine, st. augustinePhoto Location: St. Augustine, FloridaPhotographer: Dr. Roy WinkelmanDate of Photo: 10/08/2011Device Make: CanonDevice Model: Canon EOS 5D Mark IIExposure Time: 0.0166667F Number: 9Original Dimensions: 5616×3744Picture Orientation: LandscapeGPS Coordinates: 29°53'52.65"N 81°18'43.88"WPicture Number: 25120
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