Unified Soil Classification System - Symbol Chart

Symbol Chart

Major divisions Group symbol Group name
Coarse grained soils
more than 50% retained on No.200 (0.075 mm) sieve		 gravel
> 50% of coarse fraction retained on No. 4 (4.75 mm) sieve		 clean gravel <5% smaller than #200 Sieve GW well-graded gravel, fine to coarse gravel
GP poorly graded gravel
gravel with >12% fines GM silty gravel
GC clayey gravel
sand
≥ 50% of coarse fraction passes No.4 sieve		 clean sand SW well-graded sand, fine to coarse sand
SP poorly graded sand
sand with >12% fines SM silty sand
SC clayey sand
Fine grained soils
more than 50% passes No.200 sieve		 silt and clay
liquid limit < 50		 inorganic ML silt
CL clay
organic OL organic silt, organic clay
silt and clay
liquid limit ≥ 50		 inorganic MH silt of high plasticity, elastic silt
CH clay of high plasticity, fat clay
organic OH organic clay, organic silt
Highly organic soils Pt peat

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