The Peru series consists of very deep, moderately well drained soils that formed in dense, loamy glacial till.
Permeability is moderate in the solum, and moderately slow in slow in the dense substratum.
Slope ranges from 0 to 35 percent. Peru fine sandy loam, on a west-facing slope of 10 percent in a stony forested site with a 1 inch layer of undecomposed leaves and twigs. Solum thickness ranges from 12 to 36 inches. Rock fragments are dominantly gravel with some cobbles and a few stones, and range from 5 to 30 percent in the solum and 0 to 30 percent in the substratum. The silt content in the solum and substratum is less than 50 percent, but ranges to 50 percent or more in the upper 10 inches of the solum.