Geologic image in the Kentucky Geological Survey data repository.Image Name: Chattanooga Shale, Russell County Image Date: 9/9/2004 Category: photo_outcrop Source: Carey, Dan Format: JPG Size (MB): 0.1 Pixel Dimensions: 2816 x 2112 Description: The Chattanooga Shale is the equivalent of the New Albany Shale in Estill County, which is well known for exhibiting pyrite expansion. The telltale yellow weathering usually denotes the presence of pyrite. Care must be taken to check for swelling shales when building on this material. Photo by Bart Davidson, Kentucky Geological Survey.