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Montana de Oro State Park. Park gets its name "Mountain of Gold" from the many wildflowers that color the coastal hills in spring. 7,828 acres. Most prominent geologic feature is Valencia Peak, 1,347 ft (411m). Geology includes excellent examples of the Monterey Formation, a widespread, thick body of silica-rich rock laid down in Miocene time, approximately 16 to 6 million years ago.