Ključne riječi: Nature at Your Door Frank Taylor, Coquina clams, Donax variabilis, clams, shells, shells on the beach, shell identification, sea shell identification, colorful shells, clam shells, colorful clams, tiny colorful clam shells, identifying shells, Shell ID, What kind of shell is this, St Augustine, Castillo de San Marcos, Spanish Fort, geology, sedimentary rock, coquina quarry, coquina stone, coquina rock, algae, detritus, indicator species, nature, natural history
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