Coquina is a sedimentary rock composed chiefly of shell fragments. Because shells are made of calcium carbonate, coquina is formally a limestone San Ignacio Lagoon, Baja California, Mexico

Coquina is a sedimentary rock composed chiefly of shell fragments. Because shells are made of calcium carbonate, coquina is formally a limestone San Ignacio Lagoon, Baja California, Mexico

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