The plasticity index is used to determine soil texture. A C horizon often contains coarse fragments from residuum. In a well developed soil, B horizons are often illuvial horizons. Soils forming on slopes generally have thiner horizons than soils forming in low lying areas. Residuum is transported parent material.
Parent material determines the properties of young soils.
O horizons are often found beneath E horizons. Granular structure is typical in subsurface horizons that contain large amounts of clay. E horizons often have a coarse texture and a pale or bleached color. You have used a cylindrical sampling device to take a soil core with a diameter of 2.5 inches and has a length of 4 inches. The soil core has a wet weight of 1.5 lb.