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
Rocky Mount State Historic Site a living museum that recreates the year 1791, when William Blount was in residence as governor. It is next to the DeVault-Massengill House. Rocky Mount State Historic Site Rocky Mount, in Piney Flats, Tennessee, also known as the Cobb-Massengill House, was the first territorial capital of the Southwest Territory. The property of William Cobb, the original residence at Rocky Mount served as the territorial capital from 1790 to 1792. Dendroarchaeological investigations at the site by the University of Tennessee revealed that the present dwelling dates to the late 1820s. The property is owned by the State of Tennessee and has