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BIRI ISLAND ROCK FORMATION. The Biri Island rock formation is composed of four small, rocky islands located in that perilous area where the San Bernardino Strait meets the Pacific Ocean. The incredible strength of these natural forces has caused the islands to take on distinct and interesting shapes. Geologists from the University of the Philippines state that the rocks date back from the Early Miocene Period, and their ages range from five to 23 million years old. (Photo and caption from philippinegems.com)