This is a close-up view of a coquina limestone ashlar. Tabby mortar fills the joints between ashlar blocks. These blocks are part of a wall, at Castillo de San Marcos. 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. augustine, stone wall, tabby mortarPhoto 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: 25123
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