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Gelisols
Soils with permafrost within 2m of the soil surface

Histosols
Organic soils (>20% organic matter)

Spodosols
Acid forest soils with a subsurface accumulation of metal-humus complexes

Andisols
Soils formed in volcanic ash

Oxisols
Intensely weathered soils of tropical and subtropical environments

Vertisols
Clayey soils with high shrink/swell capacity
Aridisols
Soils or arid environments with subsurface horizon developments
Ultisols
Strongly leached soils with subsurface clay accumulation and <35% base saturation
Mollisols
Grassland soils with high base saturation
Alfisols
Moderately leached soils with subsurface day accumulation and > or = 35% base saturation
Inceptisols
Soils with weakly developed subsurface horizons
Entisols
Brand new soils with almost no horizons