Ground-penetrating radar (GPR) is a geophysical tool that has the capability, given the right soil chemical properties, to adequately estimate: 1) depth to bedrock and 2) the soil volume occupied by coarse fragments. Both of these soil attributes are extremely difficult to approximate with a reasonable amount of confidence. Soils located in the southern Appalachian Mountains have low 2:1 clay content and as a result a low cation exchange capacity (CEC). Clay mineralogy and CEC are two factors that cause signal attenuation, thus inhibiting the collection of accurate data. This study was conducted on plots which are apart of the Southern Appalachian Silviculture and Biodiversity (SASAB) Project. Three tree plots (20m x 20m) within each control plot were scanned with a 200Mhz GPR antennae at 3 paired research study sites (N =6) in the Ridge and Valley, Cumberland Plateau and Allegheny Plateau physiographic regions. Average depth to bedrock and coarse fragment content were estimated from the GPR data collected by developing a method for analyzing and approximating the volume occupied by coarse fragments using RADAN^TM GPR analysis software. Soil depth and coarse fragment content varied tremendously in each physiographic region. Future research will incorporate these data for refining and developing more accurate site index equations.