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THE FORMATION OF THE MARIANA ISLANDS (25 to 50 million B.C.)
The geologic event forming the Marianas archipelago occurred during the Eocene epoch, a time when dinosaurs had already become extinct, plants, fishes and invertebrate mammals had developed and the major mountains of the world had begun to rise. Man would not appear for another 25 to 50 million years, a period so distant from the present as to equal 350,000 to 700,000 human life spans.