Geologic image in the Kentucky Geological Survey data repository.Image Name: Image Date: 1/1/2002 Category: photo_outcrop Source: Roadside Geology along the Alexandria to Ashland Highway - Kentucky 9, Kentucky 10, and U.S. 23 between Greenup Locks and Dam and Interstate 64 Format: JPG Size (MB): 0.34 Pixel Dimensions: 1494 x 1034 Description: Olive Hill Clay Bed of the Breathitt Formation, which underlies sandstone fill of an ancient river channel. Flint Hill Clay Bed is mined throughout northeastern Kentucky to produce bricks used in high-temperature furnaces.