It is loamy fine sand or fine sandy loam. Reaction ranges from moderately acid to very strongly acid. The B horizon has hue of 10YR, value of 4 through 6, and chroma of 2 through 6. The Bt horizon is fine sandy loam, sandy loam, or loam. It averages between 12 and 18 percent clay and between 45 and 80 percent sand.
Reaction ranges from moderately acid to very strongly acid.
Some pedons have a BC horizon. The C horizon has hue of 10YR or 7.5YR, value of 4 through 6, and chroma of 2 through 8, and commonly contains iron and manganese stains or accumulations. It is stratified sand to loam and some pedons contain a component of gravel or thin strata of gravel. Reaction ranges from moderately acid to mildly alkaline and some pedons contain carbonates. Roby is the only series in this family.