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Unified Soil Classification System: Symbol Chart


Symbol Chart


Major divisions Group symbol Group name
Coarse grained soils
more than 50% retained on or above 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
50% or more passing the No.200 sieve
silt and clay
liquid limit < 50
inorganic
ML silt
CL clay of low plasticity, lean 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

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Sub-Topics for Unified Soil Classification System
  1. Unified Soil Classification System (overview)
  2. Symbol Chart