Mount Rushmore

Mount Rushmore National Memorial is a sculpture carved into the granite face of Mount Rushmore, a granite batholith formation in the Black Hills in Keystone, South Dakota, United States. Sculpted by Danish-American Gutzon Borglum and his son, Lincoln Borglum, Mount Rushmore features 60-foot (18 m) sculptures of the heads of four United States presidents: George Washington (1732–1799), Thomas Jefferson (1743–1826), Theodore Roosevelt (1858–1919), and Abraham Lincoln (1809–1865) The entire memorial covers 1,278.45 acres (2.00 sq mi; 5.17 km²) ^[3] and is 5,725 feet (1,745 m) above sea level.^[4]

• http://en.wikipedia.org/wiki/Mount Rushmore
• Page 166 - Dicka, A. B., 2012, 101 American Geo-sites you've gotta see: Mountain Press Publishing Co., 250p.