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
Howard Rushmore prominent Manhattan public relations firm. Meanwhile, Rushmore tried to get Harrison to publish a story about former First Lady Eleanor Roosevelt having an alleged affair with her African American chauffeur. When Harrison refused, Rushmore quit. By early February 1956, Rushmore was reportedly an editor at the "National Police Gazette". The next spring, despite Giesler's reassurances to the press, the legal effort against "Confidential" would go nowhere. Since the magazine was domiciled in New York State, and the plaintiffs were California residents who initiated the suits in their own state, the suits were stopped. On March 7, 1956, Los Angeles Supreme