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Table 2. Modified Wentworth Particle Size Scale. <br />Approx. <br />Mamouth Boulder <br />Very Large Boulder <br />Large Boulder <br />Medium Boulder <br />Small Boulder <br />Large Cobble <br />Small Cobble <br />Very Course Gravel <br />Coarse Gravel <br />Medium Gravel <br />Fine Gravel <br />Pea Gravel <br />Very Course Sand <br />Sand <br />Silt-Clay <br />RANGE MEDIAN <br />mm mm <br />4000 <br />3500 - 4000 3750 <br />3000 - 3500 3250 <br />2500 - 3000 2750 <br />2000 - 2500 2250 <br />1650 - 2000 1825 <br />1330 - 1650 1490 <br />1000 - 1330 1165 <br />830 - 1000 915 <br />665 - 830 750 <br />500 - 665 580 <br />415 - 500 450 <br />335 - 415 375 <br />250 - 335 290 <br />190 - 250- 220 <br />130 - 190 160 <br />100 - 130 115 <br />64 - 100 85 <br />50 - 64 57 <br />32 - 50 40 <br />16 - 32 24 <br />8 - 16 12 <br />4 - 8 6 <br />2 - 4 3 <br />1 - 2 1.5 <br />.062 - 1 .5 <br /> .062 -- <br />5 <br />