Roll is located at . The Blackford County area sits on top of former gas and oil fields. The area also has limestone formed from silt and mud deposited from an ancient sea. The land is flat from the work of a glacier, and the soil is excellent for farming.See pages 289-293 of Moore’s Hoosier Cyclopedia. See also the entire 1895 report of the Indiana Department of Geology and Natural Resources, especially pages 12, 14, 17, and 20. Moore's
