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 Arapiles-Tooan State Park Mount Arapiles-Tooan State Park The Mount Arapiles-Tooan State Park is a state park in the Wimmera plains of western Victoria, Australia. It encompasses Mount Arapiles, Mitre Rock, and the Tooan block. The park covers an area of and is valuable for nature conservation, with approximately 14% of the State's flora species represented in the Mount Arapiles area. The major landmarks in the park are: The park is managed by Parks Victoria. Arapiles and its immediate vicinity are home to approximately 14% of the State's flora species, with wildflowers being particularly prominent in spring. The shingleback lizard (also known as the