GW

Well-graded gravels, gravel/sand mixture, little or no fines

GP

Poorly graded gravels, gravel/sand mixture, little or no fines

GM

Gray calcareous gravel, sand/silt mixture

GC

Gray calcareous gravel/sand/clay mixtures

SW

Well graded sands, gravelly sands, little or no fines

SP

Poorly graded sands, gravelly sands, little or no fines

SM

Silty sands, sand/silt mixtures

SC

Clayey sands, sand/clay mixtures

ML

Inorganic silts and very fine sands, silty/clayey fine sand

CL

Inorganic clays of low to medium plasticity, sandy silty or lean clays

OL

Organic silts and organic silty clays of low plasticity

MH

Inorganic silts, micaceous or diatomaceous fine sandy or silty soils, elastic silts

CH

Fat clays

OH

Fat organic clays

PT

Peat, humus, and other organic swamp soils

SP-SM

Sandy, gravelly, silty mixtures

L

Limestone

S

Sandstone