This appears to be some type of sedimentary rock, or possibly tabby made with small shell particles. There is one large hole, and many small pits, in this surface. The surface has an irregular texture. 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, fort marion, irregular texture, pitted stone, saint augustine, st. augustine, stone surfacePhoto Location: St. Augustine, FloridaPhotographer: Dr. Roy WinkelmanDate of Photo: 10/08/2011Device Make: CanonDevice Model: Canon EOS 5D Mark IIExposure Time: 0.0166667F Number: 16Original Dimensions: 5616×3744Picture Orientation: LandscapeGPS Coordinates: 29°53'52.65"N 81°18'43.88"WPicture Number: 25136
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