Geologic image in the Kentucky Geological Survey data repository.Image Name: Clay Shale, Lewis County Image Date: 11/6/2006 Category: photo_scene Source: Carey, Dan Format: JPG Size (MB): 2 Pixel Dimensions: 1624 x 1596 Description: Clay shales in the Estill Shale of the Crab Orchard Group provide soils for agriculture in the Knobs and Shale Region of Lewis County, but drainage is required. Photo by Dan Carey, Kentucky Geological Survey.