Sample G7 G8 Grain size (µm) Cumulative (%) Frequency (%) Cumulative (%) Frequency (%) 0.11 0.00 0.00 0.00 0.00 0.58 0.91 0.91 1.11 1.11 1.06 3.62 2.72 4.53 3.42 1.95 9.50 5.88 11.39 6.86 4.19 22.65 13.15 24.35 12.96 7.72 36.76 14.11 36.46 12.11 14.22 51.55 14.79 47.88 11.42 35.56 73.43 21.88 63.97 16.09 63 82.50 9.07 71.80 7.83 125 90.90 8.40 78.20 6.40 250 95.20 4.30 83.80 5.60 500 96.20 1.00 87.50 3.70 1000 97.40 1.20 88.40 0.90 2000 97.80 0.40 88.60 0.20 5000 98.40 0.60 93.00 4.40 10000 100.00 1.60 100.00 7.00 20000 100.00 0.00 100.00 0.00 30000 100.00 0.00 100.00 0.00 40000 100.00 0.00 100.00 0.00 50000 100.00 0.00 100.00 0.00 60000 100.00 0.00 100.00 0.00 80000 100.00 0.00 100.00 0.00 100000 100.00 0.00 100.00 0.00 200000 100.00 0.00 100.00 0.00 300000 100.00 0.00 100.00 0.00 400000 100.00 0.00 100.00 0.00 500000 100.00 0.00 100.00 0.00