Mount Umunhum is the fourth-highest peak in California's Santa Cruz Mountains. The mountain is situated in Santa Clara County, south of San Jose. It is sometimes referred to as Mount Um by locals. Most of the mountain is within the Sierra Azul Open Space Preserve. Mt. Umunhum consists of a geologic formation that is known as the Coast Range Ophiolite. This ophiolite is a piece of Middle Jurassic oceanic crust and mantle that has been obducted onto land and largely been converted to serpentinite. It has been extensively faulted and diapirically uplifted and eroded to form Mt. Umunhum and extensive outcrop areas throughout the Santa Cruz Mountain foothills and elsewhere. The Coast Range Ophiolite is also known to underlie the rocks of the Great Valley throughout central California. The exposure on the northeast face of Mt.Umunhum is one of the best Bay Area exposures of the Coast Range Ophiolite. The mountain is topped by an eight and a half story concrete radar tower, known locally as "the Cube" or "the Box". The tower was part of Almaden Air Force Station, a radar surveillance post which operated from 1958 to 1980.
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