Calvert and Croton soils have thinner sola and bedrock at depths of 36 to 60 inches. Doylestown soils have B horizons which have less clay and sand and more silt and rock fragments than the Thorndale soils. Ginat soils contain mica and have formed in medium and coarse textured alluvium. Robertsville soils do not have argillic horizons above the fragipan. Sheffield soils have calcareous C horizons of glacial till.
Thorndale soils are on uplands in shallow depressions and drainageways.
Soil materials have weathered from limestone or calcareous shales and siltstone. Slopes range from 0 to 8 percent. These are the Bedford , Conestoga , Duffield , Frederick , Hagerstown , and Lawrence soils. All except Bedford and Lawrence soils lack fragipans. Bedford soils are moderately well drained and have dominant chroma of more than 4 in the Bt horizon.