Table 5. Density gradient segregation of the coarse, medium, and fine silt fractions of the 0- to 2.5-cm-depth samples of the desert pavement and desert mound soils Desert Mound Desert Pavement Band No. Density Range (g/cm?) Weight Fraction (4) Density Range Activity (g/cm?) (%) 53 - Weight Fraction (%) Activity (%) 20 um 1 < 1.8 0.3 0 < 1.8 1.4 2 2 1.98-2.14 2.8 2 1.93-2.04 2.7 3 3 2.26-2.32 12.1 2 2.20-2.30 15.6 8 4 2.46-2.54 13.0 3 2.45=-2.52 9.9 2 5 2.56-2.62 43.0. 2 2.54-2.61 45.4 6 6 > 2.9 18.3 90 > 2.9 19.0 80 20 - 5 um 1 < 1.8 1.0 2 < 1.8 3.9 5 2 2.07-2.16 9.2 2 1.92-2.02 8.0 9 3 2.24-2.35 12.7 3 2.06-2.11 8.6 6 4 2.38-2.43 25.4 4 2.19-2.33 32.9 11 5 2.55-2.64 40.6 9 2. 36-2.56 33.6 12 6 > 2.9 4.1 78 > 2.9 3.4 57 < 1.8 8.1 7 5 - 2 um 2.3 6 2.10-2.20 14.9 15 1.94-1.99 8.9 10 3 2.20-2.26 21.4 14 2.08-2.17 15.7 10 4 2.26-2,.39 21.5 13 2.17-2.27 39.7 24 5 2.48-2 .58 32.9 17 2.27-2.36 22.4 23 6 > 2.9 1.9 36 > 2.9 0.8 26 1 < 1.8 2 .11