The Carwile series consists of very deep, poorly drained, slowly permeable soils on terraces of the uplands. They are formed in loamy alluvium or aeolian sediments of Pleistocene age.
Water runs off the surface at a negligible or low rate or is ponded.
Slope ranges from 0 to 1 percent. Solum thickness ranges from 30 to 60 inches. The BA horizon has few to common, fine to coarse, distinct or prominent redoximorphic accumulations in shades of red, brown, or yellow. The Bt, BC, and C horizons have few to common, fine to coarse, distinct or prominent redoximorphic accumulations and depletion masses in shades of brown, red, yellow, or gray. Depth to secondary calcium carbonate is 30 to more than 60 inches.