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Unified SoilClassificationi <br /> Major Divisions Group Typical Names <br /> Symbol yp <br /> Well-graded gravels and gravel-sand mixtures, <br /> Gravels GW 50% or more of Clean little or no fines <br /> Gravels <br /> course GP Poorly graded gravels and gravel-sand mixtures, <br /> fraction little or no fines <br /> retained on <br /> the 4.75 mm Gravels GM Silty gravels, gravel-sand-silt mixtures <br /> Course-Grained Soils (No. 4) sieve with Fines <br /> More than 50% retained GC Clayey gravels, gravel-sand-clay mixtures <br /> on the 0.075 mm Well-graded sands and gravelly sands, little or no <br /> (No. 200) sieve Sands Clean SW fines <br /> 50% or more of Sands Poorly graded sands and gravelly sands, little or <br /> course SP no fines <br /> fraction passes <br /> the 4.75 SM Silty sands, sand-silt mixtures <br /> (No. 4) sieve Sands <br /> with Fines <br /> SC Clayey sands, sand-clay mixtures <br /> M L Inorganic silts, very fine sands, rock four, silty or <br /> clayey fine sands <br /> Silts and Clays Inorganic clays of low to medium plasticity, <br /> Liquid Limit 50% or less CL gravelly/sandy/silty/lean clays <br /> Fine-Grained Soils Organic silts and organic silty clays of low <br /> More than 50% passes OL plasticity <br /> the 0.075 mm <br /> (No. 200) sieve M H Inorganic silts, micaceous or diatomaceous fine <br /> Silts and Clays sands or silts, elastic silts <br /> Liquid Limit greater than CH Inorganic clays or high plasticity, fat clays <br /> 50% <br /> OH Organic clays of medium to high plasticity <br /> Highly Organic Soils PT Peat, muck, and other highly organic soils <br /> Prefix: G = Gravel, S = Sand, M = Silt, C = Clay, O = Organic <br /> Suffix: W = Well Graded, P = Poorly Graded, M = Silty, L= Clay, LL < 50%, H = Clay, LL> 50% <br />