Fort built of coquina shells.

The Castillo de San Marcos is built with coquina. Made of many tiny shell fragments and sand lightly bound together with calcite, it has survived cannon balls and hurricanes but is very fragile to human contact.

The Castillo de San Marcos is built with coquina. Made of many tiny shell fragments and sand lightly bound together with calcite, it has survived cannon balls and hurricanes but is very fragile to human contact.

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