Formed over 300 million years ago during the Mississippian geological epoch, Indiana limestone is from the stratigraphic formation known as Salem limestone. This limestone is comprised of over 97% calcium carbonate (CaCO3). It is characteristically a freestone, without pronounced cleavage planes, possessing remarkable uniformity of composition, texture, and structure.

Indiana limestone has a high degree of machinability, allowing it to be shaped and textured at low cost. Over 150 years of successful use as an exterior cladding material has proven its ability to resist the forces of weather and pollution. Its light buff color blends easily with almost any other building material making it very practical for use as trim pieces in the form of sills, coping, quoins and keystones.

Often referred to as the "Nation's Building Stone," nearly 80% of the dimension limestone used in the U.S.A. is quarried in the state of Indiana. Such important older structures as the Empire State Building in New York, New York; the Tribune Tower in Chicago, Illinois; and the National Cathedral in Washington, D.C. are constructed of Indiana Limestone. More recent projects include the Federal Triangle Complex, and the U.S. Holocaust Memorial Museum in Washington, D.C.; the Myerson Symphony Center and the Dallas Museum of Fine Art in Dallas, Texas; and the 101 Federal Street building in Boston, Massachusetts.

Indiana Limestone is widely accepted as a suitable building material not only for commercial, governmental, and institutional projects, but for residential and apartment construction as well.