The Piedmont Upland section is part of the Piedmont province of the Appalachian Highlands Region. Hereafter called the Piedmont Upland, it is one of Alabama's five physiographic sections, each of which is recognized by its pattern of relief features and landforms and which differ significantly from those of adjacent sections. It occupies about 9 percent of the state [see Figure 1]. The Piedmont Upland occurs as a triangular area in east-central Alabama and includes such cities as Ashland in Clay County, Heflin in Cleburne County, and Phenix City in Russell County. It is bordered by the Tennessee Valley and Ridge section of the Valley and Ridge province to the northwest and the East Gulf Coastal Plain to the south. The Piedmont consists of a plateau that slopes from the north, with elevations commonly above 1,000 feet, to the south, where it contacts the Coastal Plain at about 500 feet.


Districts

The Tallapoosa River System
More than half of the Piedmont is drained by the Tallapoosa River and its tributaries [see Figure 3]. The main trunk of the system is about 200 miles long, entering the state near Muscadine, in Cleburne County, and leaving the Piedmont at Tallassee, in Tallapoosa County. The system drains about 3,300 square miles. On a regional scale, the Tallapoosa and Little Tallapoosa Rivers are a series of relatively straight segments broken up by abrupt changes in direction. The dominant flow directions are to the southwest, south, and west. The most abrupt change occurs near Belltown, in Cleburne County, where the Tallapoosa turns from the southwest to the south. Floodplains vary from less than 50 feet to more than one mile wide.
At the fall line, the boundary between the Piedmont Upland and the Coastal Plain, the Tallapoosa's gradient (drop in elevation per mile) increases, and the river flows through rougher terrain. Alabama Power Company constructed four dams along this stretch of the river: Martin Dam (1926), Yates Dam (1928), Thurlow Dam (1930), and Harris Dam (1983), the last being built over rapids 77 miles upstream from Martin Dam.
Natural Resources
Historically, the Piedmont Upland was valued for its mineral resources. Between 1840 and 1934, about 33,000 ounces of gold were extracted from many small workings in the Northern Piedmont and in the Brevard Fault Zone. About one-third of all gold mined in Alabama came from a series of quartz-gold veins found at Hog Mountain, 13 miles north of Alexander City, in Tallapoosa County. Today, no extensive gold-mining operations exist in the state, and no extensive prospecting is presently taking place.
Today, there are several marble quarries near Sylacauga and Auburn. Most of the quarried material is used for crushed stone, but the white Sylacauga marble from the Alabama Marble Company's quarry is mined in larger blocks, known as dimension stone, and used for architectural purposes.
Additional Resources
Guthrie, G. M. "The Timing and Techtonic Mechanisms of the Alleghanian Orogeny, Alabama Piedmont." Geological Society of Alabama Guidbook 33. Tuscaloosa: Geological Society of Alabama, 1995.
Steltenpohl, M. G., et al. "Geology of the Alabama Inner Piedmont Terrane." Geological Survey of Alabama Bulletin 139. Tuscaloosa: Geological Society of Alabama, 1990.
Yokal, L. S., et al. "Comparison of the Pine Mountain Block Basement-Cover Sequence with the Lower Cambrian Clastic-Carbonate Sequence of the Talladega Slate Belt." 46th Annual Meeting Guidebook Geological Society of America, Southeastern Section. Boulder, Colo.: Geological Society of America, 1997.