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) Mount Rushmore (band) Mount Rushmore was a rock band in the late 1960s from San Francisco, California that played a heavy blues rock style with psychedelic elements. The band formed in early 1967 at 1915 Oak Street, a large Victorian rooming house in the Haight-Ashbury district. The original members were Ed Levin (ex-Vipers), Warren Phillips (ex Blue House Basement), Thomas Dotzler, Mike Bolan and Danny Wei. Wei was soon replaced by Terry Kimble on bass guitar. In June and July 1967 they were featured on posters for shows at the Avalon Ballroom with many other bands including The Doors, Procol