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| Coquina is a classic of introductory labs. It is a mass of broken up shell material lightly cemented together without any fine-grained matrix. Thus, it is extremely porous bioclastic limestone. Coquinas form just offshore from beaches or in tidal channels where currents are strong enough to concentrate shells but wash away sand. |
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This is a piece of coquina from near Boca Raton, Florida. Click on the image to see a big close-up. Many coquinas retain the original coloration of the shells; this one has been naturally bleached of color. |
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