Dolomite (limestone) is comprised of calcium, magnesium, carbon, and oxygen. When exposed to high temperatures, 1900║ to 2100║, the carbon is released in the form of carbon dioxide. The result is lime.
Most of eastern Wisconsin is over the Niagara Escarpment, which runs beneath the Great Lakes. In some areas of Wisconsin, such as "Lannon Springs" and Door County, dolomite was found on, or just below, the surface. So much of the stone was quarried from the Lannon area that it became known as "Lannon Stone."
In other areas, limestone was quarried and baked in kilns to create lime. Due to changing economic conditions, the lime processing in southeastern Wisconsin was pretty much done by 1920.