Geologic image in the Kentucky Geological Survey data repository.Image Name: Ashlock Formation, Lincoln County Image Date: 4/27/2007 Category: photo_outcrop Source: Carey, Dan Format: JPG Size (MB): 1.4 Pixel Dimensions: 1624 x 1596 Description: Limestone and shale of the 450-million-year-old Ashlock Formation of the Outer Bluegrass are exposed at this roadcut on U.S. 127 near Hustonville in Lincoln County. Photo by Dan Carey, Kentucky Geological Survey.