The Horseshoe quarry is located in the SW¼, NW¼, NE¼, Sec.36, T.9S., R.7E., Saline County; Rudement and Equality 7½-minute QuadrangleIllinois (Figs. 1, 2). From Equality, travel south 2.0 mi (3.2 km) via county road to the foot of Wildcat Hills, then west 2.5 mi (4 km) on gravel road to a point 0.2 mi (0.3 km) past the turnoff to Glen O. JonesLake. The longabandoned quarry is in low, wooded hills immediately north of the road, on land administeredby the U.S. Forest Service.
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One hundred field guides, with area maps, to locations in Illinois, Indiana, Iowa, Michigan, Minnesota, Missouri, Nebraska, Ohio, and Wisconsin.