Plate 1. The (A) USDA and (B) ISSS texture class tetrahedrons show: triangles at 0% rock; projected triangles at 50% rock; apex (a) at 100% rock; and texture class labels: s = sand, ls = loamy sand, sl = sandy loam, l = loam, sil = silt loam, si = silt, scl = sandy clay loam, cl = clay loam, sicl = silt clay loam, sc = sandy clay, sic = silt clay, and c = clay. (C) Soil separates for clay, silt, and sand for the USDA and ISSS systems are compared