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Cima Dome is a broad sloping upland dome, the erosional remnant of granite plutons that formed deep under the Earth's surface 180 - 80 million years ago [1] when the Farallon Plate was being subducted beneath the North American Plate.[5].The Dome rises 1,500 feet (460 m) above the volcanic plain, 2,132 to 4,950 feet (650 to 1,509 m) high, and covers 70-square-mile (180 km2). Cima Dome is an extremely symmetric dome of this granitic formation type.