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MAJOR DIVISIONS GRAPHIC LETTER TYPICAL DESCRIPTIONS SYMBOL SYMBOL I� f WELL-GRADEOGRAVELS GRAVEL !► . ! GW SAND MIXTURES LITTLE OR NO GRAVEL 46 / # FINES AND CLEAN GRAVELS P ■ GRAVELLY do SOILS (LITTLE OR NO ! ��~ POORLY GRADED GRAVELS FINES) A GP GRAVEL SAND MIXTURES LITTLE DR NO FINES COARSE GRAINED SOILS SILTY GRAVELS GRAVEL-SAND GM SILT MIXTURES MORE THAN 50% GRAVELS WITH FINES OF COARSE FRAC (APPRECIABLE TION RETAINED AMOUNT OF FINES} ONNd 43REVE CLAYEY GRAVELS GRAVEL SAND GC CLAY MIXTURES ' �• WELL GRADED SANDS GRAVELLY +••' SW SANDS LITTLE OR NO FINES SAND CLEAN SAND AND [LITTLE OR NO ' e SANDY FINES) t�'4+'` SOILS POOR LY-GRADE DSANDS GRAVEL w"yy<Y A h {�ug'iti SP LY SANDS LITTLE DR NO FINES MORE THAN 50% OF MATERIAL TS LARGER THAN NO ' .u 200 SIEVE SIZE SILTY SANDS SAND SILT SANDS WITH FINES SM MIXTURES MORE THAN SD% OF COARSE FRAC IAPPRECIABtE TION PASSING AMOUNT OF FINEST NO 4 SIEVE CLAYEY SANDS SANOZLAY Sc MIXTURES fINORGANIC SILTS AND VERY FINE ML SANDS ROCK FLOUR SILTY OR CLAYEY FINE SANDS OR CLAYEY SILTS WITH SLIGHT PLASTICITY FINE SILTS INORGANIC CLAYS OF LOW TO GRAINED AND LIQUID LIMIT CL MEDIUM PLASTICITY GRAVELLY SOILS CLAYS LESS THAN 50 CLAYS SANDY CLAYS SILTY CLAYS LEAN CLAYS _ I I)I I[ ORGANIC SILTS AND ORGANIC I I I I( OL SILTY CLAYS OF LOW PLASTICITY I ))III I 111111 INORGANIC SILTS MICACEOUS OR MH DIATOMACEOUS FINE SAND OR SILTY SOILS MORE THAN 50% SILTS OF MATERIAL ISAND LIQUID LIMIT INORGANIC CLAYS OF HIGH SMALLER THAN NO CLAYS GREATER THAN SO CH PLASTICITY FAT CLAYS 200SIEV?ESIZE / rrrr ORGANIC CLAYS OF MEDIUM TO OH HIGH PLASTICITY ORGANIC SILTS PEAT HUMUS SWAMPSOILSWITH HIGHLY ORGANIC SOILS PT HIGH ORGANIC CONTENTS NOTE DUAL SYMBOLS ARE USED TO INDICATE BORDERLINE SOIL CLASSIFICATIONS I UNIFIED SOIL CLASSIFICATION SYSTEM ROGER FOOTT ASSOCIATES, INC. FIGURE A-1