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Coquina Close-Up

Coquina Close-Up

This picture gives a close-up view of the coquina that composes the Castillo de San Marcos. The coquina walls received numerous firings from cannonballs without shattering due to the rock's physical structure; the coquina contains many tiny air pockets, which made the walls compressible and therefore resistant to shattering.
Galleries: Castillo de San Marcos, Rock Specimens, St. Johns
Keywords: castillo de san marcos, close-up, coquina, florida, fort marion, national park service, st. augustine, u.s. national monument, u.s. national register of historic places
Photo Location: Castillo de San Marcos, St. Augustine, Florida
Photographer: Dr. Roy Winkelman
Date of Photo: 12/18/2013
Device Make: Canon
Device Model: Canon EOS 5D Mark II
Exposure Time: 0.025
F Number: 22
Original Dimensions: 5616×3744
Picture Orientation: Landscape
GPS Coordinates: 29°53′52″N 81°18′41″W
Picture Number: 25628