Indiana Limestone
Indiana limestone — also known as Bedford limestone in the building trade — has long been an economically important building material, particularly for monumental public structures. Indiana limestone is a more common term for Salem Limestone, a geological formation primarily quarried in south central Indiana, USA, between the cities of Bloomington and Bedford. It has been called the best quarried limestone in the United States.
Indiana limestone, like all limestone, is a rock primarily formed of calcium carbonate. It was deposited over millions of years as marine fossils decomposed at the bottom of a shallow inland sea which covered most of the present-day Midwestern United States during the Mississippian Period.