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UNIFIED SOIL CLASSIFICATION SYSTEM <br /> MAJOR DIVISIONS SYMBOLS CODE TYPICAL NAMES <br /> GW a' 4a' :ll Well graded gravels or gravel — sand mixtures, little or no fines <br /> R S :b : . <br /> 0 (More CP 6Q o O o Poorly graded gravels or gravel — sand mixtures, little or no fines <br /> N e (More than 1/2 of <br /> o 'i coarse fraction > GM Silty grovels, gravel — sand — silt mixtures <br /> o w N no. 4 sieve size) - <br /> \ H GC Clayey gravels, gravel — sand — clay mixtures <br /> 0 o SW Well graded sands or gravelly sands, little or no fines <br /> I" � N SANDS <br /> o ` (More than 1/2 of SP i Poorly graded sands or gravelly sands, little or no fines <br /> U " A coarse fraction < SM Silty sands, sand — silt mixtures <br /> no. 4 sieve size) <br /> SC Clayey sande, sand — clay mixtures <br /> ML Inorganic silts and very fine sands, rock flour, silty or clayey <br /> SILTS & CLAYS fine sands or clayey silts with slight plasticity <br /> � 'N e CL Inorganic clays of low to medium plasticity, gravelly clays, <br /> of a m LL < 50 sandy clays, silty clays, lean clays <br /> wN OL Organic silts and organic silty clays of low plasticity <br /> m <br /> Z <br /> ` oi II I I Inorganic silts, micaceous or diatomaceous fine sandy <br /> � � rN SILTS & CLAYS MH I I I I or silty soils, elastic silts <br /> w d d <br /> `o CH Inorganic clays of high plosticity, fat clays <br /> � V <br /> LL > 50 Organic clays of medium to high plasticity, organic <br /> OH silty clays, organic silts <br /> HIGHLY ORGANIC SOILS Pt ==— <br />