Reddit reviews Roadside Geology of Wisconsin

"A resistant dolomite layer crops out at the bottom of a stone stairway leading down from a refreshment building near Picnic Area 5 and forms a low waterfall in the river. One layer in the rock here proved ideal for making water lime, a cement that would harden even underwater. Unlike the Silurian dolomites, just enough shale is associated with the layer of Devonian limestone to make high-quality cement. For thirty years, beginning in the 1870s, an important cement industry occupied this site, but the Milwaukee Cement Company quarries, crushers, and huge kilns were long ago replaced by a green park."

Dott, Robert H., and John W. Attig. Roadside Geology of Wisconsin. Missoula, MT: Mountain Pub., 2004. 269-70.