Renault-SD Sinkhole Distribution and Density of Renault Quadrangle Monroe County , Illinois

Figure 1 Map of sinkhole density within the sinkhole plain determined at the section level, showing the location of the Columbia, Waterloo, and Renault Quadrangles and major structural features. Sinkhole counts were derived from U.S. Geological Survey 7.5-minute quadrangle maps (modified from Panno et al. 1998).