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