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MAJOR DIVISIONS SYMBOLS TYPICAL NAMES <br /> GW Well-graded gravels or gravel-sand mixtures .little or no fines <br /> GRAVELS <br /> GP Poorly graded gravels or gravel—sand mixtures , little or no fines <br /> N <br /> a (More than 1/2 of <br /> 0 u <br /> coarse fraction > G M Silty gravels , gravel -sand -silt mixtures <br /> \ no. 4 sieve size) G C Clayey grovels , gravel-sand -cloy mixtures <br /> co SW Well-graded sands or gravelly sands , little or no tines <br /> .� _ SANDS <br /> N c SP Poorly graded sands or gravelly sands little or no fines <br /> a A (More than 1/2 of <br /> coarse fraction < SM Silty sands , sand -silt mixtures <br /> Q no. 4 sieve size) <br /> SC Clayey sands sand-clay mixtures <br /> Inorganic silts and very fine sands , rock flour , silty or Clayey <br /> v> ML fine sands or clayey silts with slight plasticity <br /> SILTS a CLAYS <br /> N N C L Inorganic clays of low to medium plasticity , gravelly clays, <br /> sandy clays , silty clays , lean clays <br /> O > LL < 50 <br /> Z- Z7, <br /> OL Organic silts and organic silty clays of low plasticity <br /> < t C) M H Inorganic silts micaceous Or diatomaceous fine sandy or silty I <br /> SILTS S CLAYS soils elastic silts <br /> Z o CH Inorganic Clays of high plasticity , fat clays <br /> LL > 50 Organic clays of medium to high <br /> 0 H g plasticity , organic silty <br /> Clay , org l is silts <br /> �.. <br /> HIGHLY ORGANIC SAILSPt Peat and other highly organic soils <br /> r- <br /> UNIFIED SOIL CLASSIFICATION SYSTEM_ <br /> COHESIVE SOILS GRANULAR SOILS <br /> CLASSIFICATION RANGE OF GRAIN SIZES <br /> FDescription Blows/ft. Description Blows/ft. I <br /> U. S. Standard grain Size <br /> very soft < 2 very loose Sieve Size in Millimeters <br /> < 5 <br /> soft Boulders above 121. <br /> 2 - 4 loose aFbove 305 <br /> medi5 - 8 medium dense 11 - 30 " 3 <br /> 5 10 Cobbles I <br /> um(firm) I 12" to 305 to 76.2 <br /> stiff 9 - 15 Gravel 311 to no. 4 <br /> dense 31 (c) 76.2 to "4.76 <br /> — 50 coarse 3" to 3/a" <br /> very stiff 16 tine (f) 76-2 to 19.1 <br /> 30 very dense > 50 3/4" to no. 4 19.1 to 4,76 <br /> hard > 30 Sand no. 4 to no. 200 4.76 to 0.074 <br /> Coarse (c) no. 4 to no. 10 <br /> 4.76 !0 2.00 <br /> CONSISTENCY CLASSIFICATION medium (m) no. 10 to no. 40 <br /> 2.00 to 0.420 <br /> fine (f) no. 40 to no. 200 <br /> 0.420 to 0.074 <br /> v <br /> 60 Silt Q Clay below no. 200 <br /> below 0.074 <br /> x 50---__ <br /> uGRAIN SIZE CLASSIFICATION <br /> a <br /> 40 <br /> v� <br /> 30 r P <br /> U <br /> CL. <br /> CH <br /> X1 a <br /> 7 MH <br /> 4 CL-ML NL B OL <br /> 0 10 20 30 40 50 60 TO 8a 90 100 <br /> LIQUID LIMIT <br /> PLASTICITY CHART <br />