MESOAMERICAN BARRIER REEF, BELIZE

PLUM ISLAND SOUND, MASSACHUSETTS

NAHANT, MASSACHUSETTS

NAMBIA

ROATAN, HONDURAS

BOGUE BANKS, NORTH CAROLINA

SANTA CRUZ, CALIFORNIA

SNAKE RIVER FLOOD BASALTS & CARBONATES, MELBA, IDAHO

DEL PUERTO OPHIOLITE & Mg-CARBONATES, DEL PUERTO, CALIFORNIA