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  Limestone typically is formed by the precipitation of calcium carbonate, which is the chemical substance from which the mineral calcite is formed. The calcium carbonate may be dissolved in seawater, or it may have been accumulated by organisms that lived in oceans.
Limestone is versatile,
warm, beautiful and durable. It's used as tiling, flooring, interior
and exterior design.
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Limestone is a fine- to medium-grained crystalline rock. It chiefly is composed of the mineral calcite. Ohio limestone sometimes contains the fossil remains of animals or plants that lived in the oceans from which the limestone was formed.
Much of the limestone that is found in Ohio today occurs in the western half of the state.
Limestone is an important industrial mineral in Ohio. Builders used a variety of limestone known as "Columbus Limestone" for the exterior walls of the Ohio Statehouse. The building stone was taken from a quarry on the west banks of the Scioto River.