It is named for the nearby landmark of Pilot Mountain, a distinctive geological formation. It lies near and touches the western base of the geological formation Stone Mountain. Taylor County is dissected by the Fall Line geological formation. Clingmans Dome is part of a geological formation known as the Copperhill Formation. This geological formation has not been dated radiometrically. A formation or geological formation is the fundamental unit of lithostratigraphy. The topography is almost plain, with no major geological formation. The Bruce Peninsula contains part of the geological formation known as the Niagara Escarpment. It is also well known for an unusual geological formation dubbed "the keyhole". The geological formation of the state is greatly varied. Meteorite impacts have altered the natural geological formation processes. Though geographically separate from the Sierra Nevada, they are part of the same geological formation. The Charmouth Mudstone Formation is a geological formation in England. The Delta region is bisected by a geological formation known as Crowley's Ridge. Rich deposits of nickel sulphide ore were discovered in the Sudbury Basin geological formation.