The Poplar Hill area lies in the southwest corner of Giles County, Virginia and contains marine sedimentary rocks that range in age from Middle Cambrian to Middle Bilurian. The formations trend northeast in narrow outcrop belts. The summit of Walker Mountain is the southeastern boundary of the area and the southern slopes of Brushy and Buckeye Mountains form the northwestern boundary. Nineteen different rock formations are recognized and are mapped, measured, and described in detail. The geologic structure of the area is described and includes a major thrust fault, a homocline, two synclines, and two anticlines, all illustrated on the geologic map (P1. 1). The geologic history of the area is briefly discussed and several possible localities for limestone and dolomite quarries are described. / Master of Science