Aquifer material is composed of fractured sedimentary rocks.
Water yielding rocks are typically sandstones and, occasionally, coal seams.
The area is underlain by metamorphic, igneous, sedimentary, and carbonate rocks. Aquifers in the region consist of fractured metamorphic, igneous, and sedimentary rocks. Regolith is typically thinner than in the Piedmont and faulting and folding typically greater. The Piedmont has considerably more topographic relief than the Coastal Plain with gently rolling uplands having as much as 500 ft. of local relief. The region is underlain by metamorphic and igneous rocks with an overburden of unconsolidated material known as regolith.