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 Rushmore (band) Harum, The Paul Butterfield Blues Band, The Grateful Dead, Steve Miller, Santana, Quicksilver Messenger Service, and Big Brother and the Holding Company. In June 1967 Mount Rushmore played 2 sets at The KFRC Fantasy Fair and Magic Mountain Music Festival; it was just one week before the Monterey Pop Festival which is considered the world's first "Rock Festival". In March 1968 Dotzler left to join local band Phoenix, and was soon followed by Phillips and Levin. Bolan and Kimble added Glenn Smith and Travis Fullerton to the line up and the group made two albums. Warren B. Phillips was the