In some pedons the lower part of the Bt horizon contains soft calcium carbonate accumulations and calcium carbonate nodules. Some pedons have discontinuous layers of hard limestone up to 2 inches thick and 1 to 4 feet in length or width. Some pedons have a BC horizon with the same color range as the Btg horizon, except for the additional colors in hue of 10YR, value of 6 or 7, and chroma of 3. It is loamy sand, loamy fine sand, sandy loam, fine sandy loam or very fine sandy loam. It is mildly alkaline or moderately alkaline and in some pedons contains soft calcium carbonate accumulations and calcium carbonate nodules.
Texture is variable and ranges from sand to sandy clay loam.
It is neutral to moderately alkaline. In most pedons, it is calcareous in some part or throughout. In some pedons, the lower part of the C horizon is a mixture of shells, shell fragments, and sand. In some pedons a layer of soft limestone about 1.5 to 3 feet thick underlies the Btg, BC, or C horizons between depths of 40 to 80 inches. Beneath the limestone is variable sand to sandy clay loam mixed with shells and shell fragments.