Geologic image in the Kentucky Geological Survey data repository.Image Name: Cover-Collapse Sinkhole in St. Louis Limestone, Wayne County Image Date: 9/11/2004 Category: photo_scene Source: Carey, Dan Format: JPG Size (MB): 0.1 Pixel Dimensions: 3292 x 1396 Description: Cover-collapse sinkholes such as this one in the St. Louis Limestone in Wayne County may appear overnight when the soil plug at their base collapses into a fracture or cave in the underlying limestone. These are direct conduits to the local aquifer, and as such are susceptible to contamination by garbage dumping and accidental spills. They are also hazards to public safety. Photograph by Bart Davidson, Kentucky Geological Survey.