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F41 F MAJOR DIVISIONS GIRAPHIC LETTER SYMBOLSYMBOL TYPICAL DESCRIPTIONS YI s:: WELL-GRADED GRAVELS,GRAVEL SAND MIXTURES,LITTLE OR NO GRAVELjs,,is / ' GW FINES r AND CLEAN GRAVELS r GRAVELLY SOILS (LITTLE OR NO •�~� � FINEST ��' POORLY•GRADEDGRAVELS, ,j•,•„ GP GAgVELSANOMIXTURES,LITTLE COARSE .: .: ... OR NO FINES GRAINED ��: i::: SOILS SILTY GRAVELS,GRAVEL-SAND. MORE THAN 6096 GRAVELS WITH FINES GM SILT MIXTURES OF COARSE FRAC. (APPRECIABLE TION RETAINED AMOUNT OF FINES) ONN .4f SIEVE CLAYEY GRAVELS,GRAVEL-SAND- - GC CLAY MIXTURES •or,o o' WELL-GRADED SANDS,GRAVELLY SAND CLEAN SAND 0 G SW SANDS,LITTLE OR NO FINES • AND SANDY (LITTLE OR NO o !o 0 0 SOILS FINES) •Y, 'r�:r?: POORLY-GRADEDSANDS,GRAVEL- MORE THAN 50% SP LY SANDS.LITTLE OR NO FINES OF MATERIAL IS LARGER THAN N0, 200 SIEVE SIZE j SILTY SANDS,SAND-SILT j MORE THAN 50% SANDS WITH FINES !l SM MIXTURES 1 OF COARSE FRAC- (APPRECIABLE TION PASSING AMOUNT OF FINES) NO.4 SIEVE CLAYEY SANDS,SAND-CLAY SC MIXTURES I I INORGANIC SILTS AND VERY FINE IML SANDS,ROCK FLOUR,SILTY OR ! CLAYEY FINE SANDS OR CLAYEY SILTS WITH SLIGHT PLASTICITY i FINE SILTS F` INORGANIC CLAYS OF LOW TO 5 GRAINED AND LIOUIDLIMIT CL MEDIUM PLASTICITY,GRAVELLY SOILS CLAYS LESS THAN 50 CLAYS,SANDY CLAYS,SILTY CLAYS,LEAN CLAYS I ORGANIC SILTS AND ORGANIC ? ' I I I I 1111 I OL SILTY CLAYS OF LOW PLASTICITY 111111x11 ' � 1111)111 -I INORGANIC SILTS,MICACEOUS OR x MH DiATOMACEOU5FINE SAND OR SILTY SOILS I ...,. MORE THAN 50% SILTS OF MATERIAL IS AND LIQUID LIMIT INORGANIC CLAYS OF HIGH SMALLER THAN NO, CLAYS GREATER THAN 50 CH 200$IEVE PLASTICITY,FAT CLAYS + SIZE I I iiiiii OH ORGANIC CLAYS OF MEDIUM TO HIGHPLASTICITY,ORGANIC SILTS PEAT,HUMUS,SWAMP SOILS WITH HIGHLY ORGANIC SOILS PT, HIGH ORGANIC CONTENTS NOTE: DUAL SYMBOLS ARE USED TO INDICATE BORDERLINE SOIL CLASSIFICATIONS UNIFIED SOIL CLASSIFICATION SYSTEM a ' ROGER FOOTT ASSOCIATES, INC. PLATE 3