Mount Rushmore community. Recent pine beetle infestations have threatened the forest. Mount Rushmore is largely composed of granite. The memorial is carved on the northwest margin of the Black Elk Peak granite batholith in the Black Hills of South Dakota, so the geologic formations of the heart of the Black Hills region are also evident at Mount Rushmore. The batholith magma intruded into the pre-existing mica schist rocks during the Proterozoic, 1.6 billion years ago. Coarse grained pegmatite dikes are associated with the granite intrusion of Black Elk Peak and are visibly lighter in color, thus explaining the light-colored streaks on the
Mount Magazine State Park Mount Magazine State Park Mount Magazine State Park is a 2,234-acre park located in Logan County, Arkansas. Inhabited since the 1850s, Mount Magazine first became part of the Ouachita National Forest in 1938, was re-designated as part of the Ozark National Forest in 1941, and became a state park after a 22-year conversion process from the U.S. Forest Service to the Arkansas Department of Parks and Tourism. Mount Magazine State Park is the highest park in Arkansas. The park contains Mossback Ridge, including the peak of Mount Magazine (called Signal Hill) which contains The Lodge at Mount Magazine, cabins, trails,