Unified Soil Classification System
fraction larger than No. 4 sieve size SANDS 50% or more of coarse fraction smaller than No. 4 sieve size Clean Gravels (Less than 5% fines) GW GP ... Organic silts and organic silty clays of low plasticity Inorganic silts, micaceous or diatomaceous fine sandy or silty soils, elastic silts Inorganic clays of high plasticity, fat
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