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 Washington State Forest Mount Washington State Forest Mount Washington State Forest is a publicly owned forest with recreational and scenic features covering in the town of Mount Washington, Massachusetts. The forest conjoins with New York state and the state of Connecticut in the southern Taconic Mountains of the southwestern Berkshire region of Massachusetts. Bash Bish Falls State Park lies adjacent to the state forest. The forest is managed by the Massachusetts Department of Conservation and Recreation. The forest was acquired by the state through gifts of Alfred F. Intemann (1897-1986) and his wife Cornelia Van der Smissen Intemann (who died in 1963) conveyed