What this list doesn't know we make up. Jims right the USGS link should supply the info you're looking for. if you want to get your hands on a real map go to the Agricultural Lab at UT in Knoxville. They have tons of geological maps. Seems like they should be in the geology dept. but they're not. The Hardin County Ag. Extension Officer can order a set to be sent to him for you to review. Chip