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The north of Guam is a result of this base being covered with layers of coral reef, turning into limestone, and then being thrust by tectonic activity to create a plateau. The rugged south of the island is a result of more recent volcanic activity. Cocos Island off the southern tip of Guam is the largest of the many small islets along the ...
Geologic map of Guam. The geology of Guam formed as a result of mafic, felsic and intermediate composition volcanic rocks erupting below the ocean, building up the base of the island in the Eocene, between 33.9 and 56 million years ago. The island emerged above the water in the Eocene, although the volcanic crater collapsed.
A History of Guam. Bess Press. ISBN 978-1-57306-068-4. Safford, William Edwin (1912). Guam, an Account of Its Discovery and Reduction, Physical Geography and Natural History: And the Social and Economic Conditions on the Island During the First Year of the American Occupation (Public domain ed.). General Books.
The history of Guam starts with the early arrival around 2000 BC of Austronesian people known today as the Chamorro Peoples. The Chamorus then developed a "pre-contact" society, that was colonized by the Spanish in the 17th century. The present American rule of the island began with the 1898 Spanish–American War.
The islands are part of a geologic structure known as the Izu–Bonin–Mariana Arc system, and range in age from 5 million years old in the north to 30 million years old in the south (Guam). The island chain arose as a result of the western edge of the Pacific Plate moving westward and plunging downward below the Mariana plate, a region which ...
The island was a major stopover for Manila Galleons sailing from Acapulco, until 1815. Guam was taken over from Spain by the United States during the Spanish–American War in 1898. As the largest island in Micronesia and the only American-held island in the region before World War II, Guam was occupied by the Japanese between December 1941 and ...
Mount Lamlam (meaning lightning in Chamoru) is a peak on the United States island of Guam. It is located near the village of Agat (5 km or 3 mi [ 3 ] north), in the south-west of the island. Rising to 406 meters (1,332 ft) above sea level, the distance from the peak to the bottom of the nearby Mariana Trench is said to be the greatest change in ...
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