Consists of 532 acres of uplands and includes woodland, prairie and glade communities. It has the largest complex of high quality loess hill prairies in Illinois. Prairies were once the dominant natural community in Illinois. The Illinois Nature Preserve system was established to give the highest level of protection to the state’s few remaining high quality natural areas; this site was dedicated as a preserve in 1970. In 1986 it was recognized federally by the U.S. Department of Interior as a National Natural Landmark.