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Indiana Limestone or Bedford Limestone is a common term for Salem limestone, a geological formation primarily quarried in south central Indiana between Bloomington and Bedford. Bloomington Indiana has been noted to have the highest quality quarried Limestone in the United States.^[1] Salem limestone, like all limestone, is a rock primarily formed of calcium carbonate. The limestone 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.

Contents 1 History 2 Today 3 Buildings 4 References and footnotes 5 External links

Native Americans were some of the first people to discover Limestone in Indiana. It was not long before settlers used this rock around their windows and doors and for memorials around town. The first quarry was started in 1827, and by 1929 Hoosier quarries yielded 340,000 m³ (12 million cubic feet) of usable stone. The expansion of the railroads brought great need for limestone to build bridges and tunnels and Indiana was the place to get it. American architecture of the late 19th and early 20th century included a lot of limestone detail work on buildings but as architecture styles changed so did the demand of limestone. With the Arab Oil Embargo of 1973 the price of alternative building materials skyrocketed so Indiana Limestone remerged as an energy efficient building material.^[2]

Today Indiana Limestone is part of a high-end market. It is mostly used on the exterior of homes and commercial buildings. With the impact of acid rain it is not used in monuments as it was in the 19th century.

Buildings such as the Empire State Building, The Pentagon, and the United States Holocaust Memorial Museum feature Indiana limestone in their exteriors. Indiana limestone was used extensively rebuilding Chicago after the Chicago Fire.

• Indiana Geological Survey explanation of Indiana Limestone

• Indiana Limestone Institute of America

• Photos of the now abandoned quarry where the Empire State building stone was taken.