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MAJOR DIVISIONS GROUP GROUP NAME <br /> SYMBOL <br /> GRAVEL CLEAN I GW WELL-GRADED GRAVEL, <br /> COARSE MORE THAN GRAVEL IFINE TO COARSE GRAVEL <br /> GRAINED 50% OF GP POORLY-GRADED <br /> SOILS COARSE GRAVEL <br /> MORE THAN FRACTION <br /> 50% RETAINED ON I GRAVEL GM SILTY GRAVEL <br /> RETAINED NO.4 SIEVE ! WITH FINES GC CLAYEY GRAVEL <br /> ON N0.200 - - <br /> SIEVE SAND CLEAN SW WELL-GRADED SAND, <br /> MORE THAN SAND FINE TO COARSE SAND <br /> 50% OF SP POORLY-GRADED SAND <br /> COARSE <br /> FRACTION SAND WITH SM SILTY SAND <br /> PASSES N0.4 FINES SC _[CLAYEY SAND <br /> SIEVE <br /> SILT AND INORGANIC ML SILT <br /> FINE CLAY CL CLAY <br /> GRAINED LIQUID LIMIT <br /> SOILS LESS THAN 50 ORGANIC OL ORGANIC SILT, ORGANIC <br /> MORE THAN �- CLAY <br /> 50% SILT AND INORGANIC MH SILT OF HIGH <br /> PASSES CLAY PLASTICITY, ELASTIC <br /> SIEVE LIQUID LIMIT SILT <br /> SIEVE 50 OR MORE - <br /> CH CLAY OF HIGH <br /> PLASTICITY, FAT CLAY <br /> ORGANIC OH ORGANIC CLAY, <br /> [ORGANIC SILT <br /> LS PT (PEAT <br /> IGHLY ORGANIC SOI <br /> Ref: Unified Soil Classification System; from American Society for Testing and Materials, 1985 <br />