Geologic image in the Kentucky Geological Survey data repository.Image Name: Image Date: 1/1/2001 Category: photo_outcrop Source: Potter, Paul Format: JPG Size (MB): 0.54 Pixel Dimensions: 1886 x 1358 Description: Sandstones of Cowbell Member overlie mudstones of the Nancy Member of the Borden Formation at the base of the Big Hill section on U.S. 421, southeast of Big Hill, Madison Co., Ky. Note carbonate concretions near the top of Nancy Member.