The Rome Formation and Maryville Limestone of the Conasauga Group contain sandstones commonly showing 6-10% porosity. Porosity development does not appear to be a risk in the high sandstone percentage areas. Two areas have the best probability for encountering porous sandstones, as shown on the sandstone percentage maps made in this study. For the Rome Formation, the structural shelf between the Kentucky River Fault System and the Irvine-Paint Creek Fault System has the highest sandstone percentages mapped. Sandstones increase toward the north against the Kentucky River Fault. This trend narrows east of the Isonville Fault, into Carter and Boyd Counties, but is still prospective. South of the Irvine-Paint Creek Fault System and in the deeper part of the Trough in West Virginia, sand quantity decreases dramatically. Reservoir risk is much higher in these areas due to lack of reservoir. Evidence for deeper water sandstones has not been seen in this study, but they cannot be ruled out.