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| | Buildings and building stone: Castillo de San Marcos, St. Augustine, Florida |
 | | Coquina in Castillo de San Marcos, St. Augustine, Florida, U.S.A. St. Augustine, Florida, holds the distinction of being the first permanent European settlement in the continental United States. |
 | | Coquina has no such matrix and only a little cement, and so it consists of shells with empty space between them. |
 | | Cannon balls failed to shatter the coquina and instead were absorbed into the rock, much as jabbing a tool into styrofoam results in holes but not in breakage of the styrofoam (see the image at right below, which is an enlargement from the top image). |
| www.gly.uga.edu /railsback/BS-SA.html (377 words) |
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