The Marble Mountain Wilderness is a 241744acre wilderness area located 60mi southwest of Yreka, California, in the United States. It is managed by the United States Forest Service and is within the Klamath National Forest in Siskiyou County. The land was first set aside on April 1931 as the Marble Mountain Primitive Area, which comprised 234957acre. It was one of four areas to gain primitive status under the Forest Service's L-20 regulations that year. In 1964, it became a federally designated wilderness area when the U.S. Congress passed the Wilderness Act. The name comes from the distinctive coloration caused by light-colored limestone along with black metamorphic rock on some peaks, giving the mountains a marbled appearance. There are at least five different rock types identified here. The wilderness is in the Klamath Mountains geomorphic province (a large area having similar features such as terrain and geology). The horseshoe-shaped Salmon Mountains are at the core of the wilderness with Marble Mountain being a north-trending spur ridge of the Salmons. The highest point in the Marbles is Boulder Peak at 8299ft.
