Group Symbol
GW
GP
GW-GM
GW-GC
GP-GM
GP-GC
GM
GC
GC-GM
SW
SP
SW-SM
SW-SC
SP-SM
SP-SC
SM
SC
SC-SM
Group Name
<15% sand
Well graded gravel
≥15% sand
Well graded gravel with sand
<15% sand
Poorly graded gravel
≥15% sand
Poorly graded gravel with sand
<15% sand
Well graded gravel with silt
≥15% sand
Well graded gravel with silt and sand
<15% sand
Well graded gravel with clay (or silty clay)
≥15% sand
Well graded gravel with clay and sand (or silty clay and sand)
<15% sand
Poorly graded gravel with silt
≥15% sand
Poorly graded gravel with silt and sand
<15% sand
Poorly graded gravel with clay (or silty clay)
≥15% sand
Poorly graded gravel with clay and sand (or silty clay and sand)
<15% sand
Silty gravel
≥15% sand
Silty gravel with sand
<15% sand
Clayey gravel
≥15% sand
Clayey gravel with sand
<15% sand
Silty clayey gravel
>15% sand
Silty clayey gravel with sand
<15% gravel
Well graded sand
≥15% gravel
Well graded sand with gravel
<15% gravel
Poorly graded sand
≥15% gravel
Poorly graded sand with gravel
<15% gravel
Well graded sand with silt
≥15% gravel
Well graded sand with silt and gravel
<15% gravel
Well graded sand with clay (or silty clay)
≥15% gravel
Well graded sand with clay and gravel (or silty clay and gravel)
<15% gravel
Poorly graded sand with silt
≥15% gravel
Poorly graded sand with silt and gravel
<15% gravel
Poorly graded sand with clay (or silty clay)
≥15% gravel
Poorly graded sand with clay and gravel (or silty clay and gravel)
<15% gravel
Silty sand
≥15% gravel
Silty sand with gravel
<15% gravel
Clayey sand
≥15% gravel
Clayey sand with gravel
<15% gravel
Silty clayey sand
≥15% gravel
Silty clayey sand with gravel
Group Symbol
PI > 7
and
plots on
or
above
"A"-line
Inorganic
LL < 50
4 ≤ PI ≤
7 and
plots on
or
above
"A"-line
PI < 4
or plots
below
"A"-line
Group Name
71 - 100
%F[200]
CL
0 - 70
%F[200]
71 - 100
%F[200]
CL-ML
0 - 70
%F[200]
71 - 100
%F[200]
ML
0 - 70
%F[200]
Organic
OL
PI plots
on or
above
"A"-line
71 - 100
%F[200]
CH
0 - 70
%F[200]
Inorganic
71 - 100
%F[200]
LL ≥ 50
PI plots
below
"A"-line
Organic
MH
0 - 70
%F[200]
OH
86 - 100 %F[200]
% sand ≥ % gravel
% sand < % gravel
% sand ≥ < 15% gravel
% gravel ≥ 15% gravel
% sand < < 15% sand
% gravel ≥ 15% sand
86 - 100 %F[200]
71 - 85 % sand ≥ % gravel
%F[200] % sand < % gravel
% sand ≥ < 15% gravel
% gravel ≥ 15% gravel
% sand < < 15% sand
% gravel ≥ 15% sand
86 - 100 %F[200]
71 - 85 % sand ≥ % gravel
%F[200] % sand < % gravel
% sand ≥ < 15% gravel
% gravel ≥ 15% gravel
% sand < < 15% sand
% gravel ≥ 15% sand
71 - 85
%F[200]
Lean clay
Lean clay with sand
Lean clay with gravel
Sandy lean clay
Sandy lean clay with gravel
Gravelly lean clay
Gravelly lean clay with sand
Silty clay
Silty clay with sand
Silty clay with gravel
Sandy silty clay
Sandy silty clay with gravel
Gravelly silty clay
Gravelly silty clay with sand
Silt
Silt with clay
Silt with gravel
Sandy silt
Sandy sily with gravel
Gravelly silt
Gravelly silt with sand
See figure for OL
86 - 100 %F[200]
71 - 85 % sand ≥ % gravel
%F[200] % sand < % gravel
% sand ≥ < 15% gravel
% gravel ≥ 15% gravel
% sand < < 15% sand
% gravel ≥ 15% sand
86 - 100 %F[200]
71 - 85 % sand ≥ % gravel
%F[200] % sand < % gravel
% sand ≥ < 15% gravel
% gravel ≥ 15% gravel
% sand < < 15% sand
% gravel ≥ 15% sand
See figure for OH
Fat clay
Fat clay with sand
Fat clay with gravel
Sandy fat clay
Sandy fat clay with gravel
Gravelly fat clay
Gravelly fat clay with sand
Elastic silt
Elastic silt with sand
Elastic silt with gravel
Sandy elastic silt
Sandy elastic silt with gravel
Gravelly elastic silt
Gravelly elastic silt with sand
PI ≥ 4 and
plots on or
above "A"line
71 - 100
%F[200]
0 - 70 %F[200]
OL
PI < 4 or
plots below
"A"-line
PI plots on
or above
"A"-line
71 - 100
%F[200]
0 - 70 %F[200]
71 - 100
%F[200]
0 - 70 %F[200]
OH
PI plots
below "A"line
71 - 100
%F[200]
0 - 70 %F[200]
86 - 100 %F[200]
% sand ≥ % gravel
71 - 85 %F[200]
% sand < % gravel
< 15% gravel
% sand ≥ % gravel
≥ 15% gravel
< 15% sand
% sand < % gravel
≥ 15% sand
86 - 100 %F[200]
% sand ≥ % gravel
71 - 85 %F[200]
% sand < % gravel
< 15% gravel
% sand ≥ % gravel
≥ 15% gravel
< 15% sand
% sand < % gravel
≥ 15% sand
86 - 100 %F[200]
% sand ≥ % gravel
71 - 85 %F[200]
% sand < % gravel
< 15% gravel
% sand ≥ % gravel
≥ 15% gravel
< 15% sand
% sand < % gravel
≥ 15% sand
86 - 100 %F[200]
% sand ≥ % gravel
71 - 85 %F[200]
% sand < % gravel
< 15% gravel
% sand ≥ % gravel
≥ 15% gravel
< 15% sand
% sand < % gravel
≥ 15% sand
Organic clay
Organic clay with sand
Organic clay with gravel
Sandy organic clay
Sandy organic clay with gravel
Gravelly organic clay
Gravelly organic clay with sand
Organic silt
Organic silt with sand
Organic silt with gravel
Sandy organic silt
Sandy organic silt with gravel
Gravelly organic silt
Gravelly organic silt with sand
Organic clay
Organic clay with sand
Organic clay with gravel
Sandy organic clay
Sandy organic clay with gravel
Gravelly organic clay
Gravelly organic clay with sand
Organic silt
Organic silt with sand
Organic silt with gravel
Sandy organic silt
Sandy organic silt with gravel
Gravelly organic silt
Gravelly organic silt with sand