Soil pH ©BONAP
Acid soils with pH < 6 ©BONAP
Neutral soils with pH 6-7 ©BONAP
Basic soils with pH > 7. ©BONAP
Serpentine and ultramafic soils and/or possible outcrops
©BONAP
Concentration of wetlands and open water areas ©BONAP
Wetland soils with nutrient-rich clays ©BONAP
Volcanic wetland soils ©BONAP
Undeveloped wetland soils ©BONAP
Weakly developed wetland soils ©BONAP
Shrink/swell clay wetland soils ©BONAP
Pine forest wetland soils ©BONAP
Prairie wetland soils ©BONAP
Wetland soils with nutrient poor clays ©BONAP
Undeveloped soils (excluding wetlands, fluvents, and psamnents) ©BONAP
Acidic organic wetland soil ©BONAP
Non-acidic organic wetland soil ©BONAP
Upland acidic sands ©BONAP
Upland acidic clays ©BONAP
Upland acidic silts/loams ©BONAP
Upland acidic shallow ©BONAP
Upland non-acidic clays ©BONAP
Upland non-acidic shallow soils ©BONAP
Excessively drained soils ©BONAP
Well-drained soils ©BONAP
Very poorly-drained soils ©BONAP
Soils with nutrient-rich clays (excluding wetlands) ©BONAP
Volcanic soils (excluding wetlands) ©BONAP
Gypsum soils ©BONAP
Organic soils (excluding uplands) ©BONAP
Mineral soils with high organic contect (excluding prairie soils) ©BONAP
Mineral soils with high organic content ©BONAP
Deep sandy soil ©BONAP
Limestone praire soils ©BONAP
Salty soils (high electric conductivity) ©BONAP
Soils with nutrient-poor clays (excluding wetlands) ©BONAP
Shrink/swell clay soils (excluding wetlands) ©BONAP
Desert soils (excluding salt flats and gypsum) ©BONAP
Non-wetland floodplain soils ©BONAP
Various soils with elements of a floodplain soil ©BONAP
Upland organic soils ©BONAP
Prairie soils (excluding wetlands) ©BONAP
Salt flats ©BONAP
Pine forest soils (excluding wetlands) ©BONAP
Rock outcrops ©BONAP
Weakly developed soils (excluding wetlands) ©BONAP
Shallow soils (bedrock within a half meter of the surface) ©BONAP
Man-made/modified soils ©BONAP
Relative soil moisture based on average drainage and climate ©BONAP
Soils of the lower 48 US states, based on dominant soil pH, textures, and wetland status (data from NRCS) ©BONAP
Soil orders and selected suborders of the United States, based on Soil Taxonomy of the USDA NRCS ©BONAP