18. Classification Group Symbols
krabo2rt5
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Main Soil
Type
Prefix Subgroup Suffix
Classification
Group symbols
Gravel G
Well-graded
Poorly-graded
Silty
Clayey
W
P
M
C
GW
GP
GM
GC
Sand S
Well-graded
Poorly-graded
Silty
Clayey
W
P
M
C
SW
SP
SM
SC
Silt M
LL < 50%
LL > 50%
L
H
ML
MH
Clay C
LL < 50%
LL > 50%
L
H
CL
CH
Organic O
LL < 50%
LL > 50%
L
H
OL
OH
Peat Pt PPrtanameshCha