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Coquina         Go on to: #1 | #2 | #3 | #4
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Basic Key
Carbonate Key
     Shell debris, sometimes whole; typically broken and wave washed.
     Badly broken, current washed, relatively well sorted, poorly cemented bivalve shell debris.
Tectonic Association
None specific, although coquinas form in conditions favorable to limestone formation.
Formation & Environments
     Coquina is a limestone consisting almost completely of mechanically transported fossil debris with little or no matrix, loosely cemented together so that the rock looks very porous. Such rocks form in zones of high energy where finer material is winnowed away. Typically the shells are clams and snails.

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Last Update: 7/18/00

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